---
product_id: 213562376
title: "Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA"
brand: "safetysiren"
price: "139078 Ft"
currency: HUF
in_stock: true
reviews_count: 12
category: "Safety Siren"
url: https://www.desertcart.hu/products/213562376-safety-siren-pro4-plug-in-radon-detector-continuous-radon-gas
store_origin: HU
region: Hungary
---

# Real-time continuous radon monitoring Audible & visual multi-mode alarms Made in USA precision Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA

**Brand:** safetysiren
**Price:** 139078 Ft
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay ahead of invisible threats with Safety Siren Pro4 — your home's radon watchdog!

## Quick Answers

- **What is this?** Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA by safetysiren
- **How much does it cost?** 139078 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/213562376-safety-siren-pro4-plug-in-radon-detector-continuous-radon-gas)

## Best For

- safetysiren enthusiasts

## Why This Product

- Trusted safetysiren brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Live Radon Insights 24/7:** Continuous digital readings with short- and long-term averages keep you ahead of invisible risks.
- • **Instant Alerts, No Surprises:** Three selectable audible alarms plus visual alerts ensure you never miss elevated radon levels.
- • **Trusted American Craftsmanship:** Engineered and manufactured in the USA since 1993 for unmatched reliability and accuracy.
- • **Effortless Night & Day Monitoring:** Backlit digital display offers crystal-clear radon data anytime, even in dim basements.
- • **Self-Monitoring for Peace of Mind:** Automatic daily self-tests guarantee consistent performance without lifting a finger.

## Overview

The Safety Siren Pro4 Plug-in Radon Detector is a US-made, photoelectric sensor device designed for continuous indoor radon gas monitoring. It delivers real-time digital radon readings with both short- and long-term averages, featuring audible and visual alarms to alert users of elevated radon levels. Its backlit display ensures easy readability in any lighting, while an automatic daily self-test maintains reliable operation. Ideal for homes, offices, and other indoor spaces, it empowers proactive radon risk management with trusted accuracy since 1993.

## Description

Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA - desertcart.com

Review: Radon Detection Device Works Well - The radon detector was received in the time expected and in a bubble envelope. It is winter and the unit was allowed to warm to room temperature. Next, it was plugged into the wall outlet. An error message appeared upon initialization. Per instructions, electric power to the unit was cycled. This time the unit came up with the correct response - beeps, flashing CAL, then dashed lines for short term and long term readings in pCi/L. Per instructions, readings appeared in place of the dashed lines in 48 hours. I had placed the device in a bedroom of the house on the second floor. The initial readings were 1.8 pCi/L. This is close to one-half of the EPA action limit of 4.0 pCi/L or 148 Bq/m^3. (Each 1 pCi/L is equal to 37 Bq/m^3.) The WHO states that 2.7 pCi/L or 100 Bq/m^3 is the action level. The WHO also states that lung cancer risk will increase by 16% for every 100 Bq/m^3 of long term exposure. It is also important to remember that cancer risk is based on long-term exposure. It does not matter if the exposure was continuous or intermittent. Exposure to radon adds up over time. If you have moved from one house to another, each new exposure adds to long-term exposure. After 7 days of monitoring the radon reading fell to 1.7 pCi/L. We fully expected that the readings in our house would increase when we moved the sensor to the first floor and then to the basement. After 6 days of monitoring of the first floor near the kitchen and laundry the reading was 1.9 pCi/L. A week later the reading had fallen to 1.0 pCi/L. Thinking that there might be something wrong, we continued to monitor the reading for another week, and it steadily climbed to a maximum value of 2.5 pCi/L. That reading persisted for 3 days, and it is steadily falling again. These results show why long term monitoring is important. It is winter and the ground is beginning to freeze, although there is no snow cover. This makes the ground more, not less, permeable to radon gas. If it rains or snows, the ground becomes less permeable to radon and the gas may be less apt to dissipate into the outside air and more apt to enter the basement. The most common point of entry is the basement, but radon can also enter through windows and doors. The water content of the soil around the house, how well the basement windows are sealed, how well the basement concrete cracks and seams are sealed and concrete porosity all contribute to basement radon levels. Radon levels (if you have well water) will usually increase in the winter in a closed house where water vapor releases radon gas from laundry, dishwasher and bathing. The contribution due to evaporation of radon laden well water is added to the contribution entering the home from the basement to get the radon total. That is what is being read on the first and second floors of our home. Readings in the basement will be due to infiltration of radon through cracks in the foundation and basement slab as well as the porosity of the concrete, itself. Our well water contains nearly 4,000 pCi/L of dissolved radon. That is less than half the EPA actionable level of 10,000 pCi/L. Every 10,000 pCi/L of dissolved radon is expected to add 1.0 pCi/L to the air in the house due to dish washing, laundering and showering. We have no direct way of knowing if an additional 0.4 pCi/L has been added due to water vapor. We can assume, however that part of the dissolved radon in our well water is removed by the charcoal filter on our domestic well water supply. There is one additional note that might be added. There is no battery backup power to the unit. However, when the detector is moved to a new location, the data from the previous location will be held until the reset command is asserted with the push button on the face of the device. We have been very happy with the functionality of this device and will use it to guide us in radon mitigation decision making in the spring. If interested, the instruction manual with specifications can be found online. The manual provides sensor accuracy specifications for short and long term measurements. This is not a professional, periodically calibrated instrument. However, the accuracy should be more than adequate for determining when to call a professional. Added note, it is spring and the ground has thawed and heaved. The ground floor radon readings for the last two weeks have been between 2.2 and 2.7 pCi/L. We also have 135 days of data for our ground floor living space and the average is 2.0 pCi/L. Currently, the sensor is monitoring the basement so that a radon fan can be sized in cubic feet per minute (CFM). The bigger the fan, the more electricity it will use on a continuous basis. Most fans use between 50 and 100W. In this locale electric power is $0.20 per kW-hour. The annual operating cost would be between $88 and $175. Update: After this review was written, we installed a radon fan in our passive radon stack. Then, we caulked all of the basement slab cracks, expansion joints and basement floor-wall joints with a high quality radon caulk to improve the vacuum under the basement slab and to reduce heat loss. We also caulked around all of the basement bottom plates because there are anchors in the bottom plates that penetrate the concrete. (If you don't caulk, the radon fan will pull conditioned air right out of the house and send it up the radon stack, so please do it.) The radon level, year-round, has dropped to 1 pCi/l or less at the point in the basement room that is farthest from the radon suction point in the basement slab. In order to increase the confidence level of the measurement, we placed an Airthings Corentium Home battery operated unit near the Pro4. Although they employ different sensors and algorithms, there is good correlation between the two, and that increases our confidence level in the measurements. We purchased largest, adjustable speed Fantech radon fan that we could find, and we run it at very slow RPM. It is capable of moving a huge volume of air when turning slowly. It employs a massive Pabst fan with excellent bearings. The fan draws barely 250 mA on 115 VAC as measured with a clip-on current probe. That's 28.75 Watts. It is hardly noticeable in our monthly electric bill, maybe $3.50.
Review: Testing all the houses - I had the radon tested when I bought the house 20 years ago, and it was low. Since then, it has been turned into a rental, but never retested. My renters got this tester, and discovered that the long term radon levels were 2.5x above the action level. I paid for a professional test, and it returned the same result. Installed radon mitigation, and this meter showed a drop to less than 10% of the previous value. Mitigation company did their own test, and again, identical results. Bought one of my own to test my house and all the other houses. This should be an essential piece of kit for homeowners, landlords, and realtors in high radon areas. Just plug it in, and it works. Keep it away from humid environments. Wait a week for accurate results. Super easy. If you have questions, the product instructions are in perfect English.

## Features

- MADE IN USA RADON DETECTOR – The Safety Siren Pro4 Series (4th Generation) radon gas detector is designed and manufactured in the USA and has been trusted since 1993 for accurate, reliable radon monitoring in homes, basements, offices, and other indoor living areas.
- CONTINUOUS RADON MONITORING – Provides real-time digital radon readings along with short-term and long-term averages, helping you monitor changing radon levels and protect your household or property from prolonged exposure.
- AUDIBLE & VISUAL ALARMS – Features three selectable audible alarm modes plus a visual alert for the hearing impaired, providing immediate in-room notification when radon levels are elevated.
- EASY-TO-READ BACKLIT DISPLAY – The clear digital screen with back-light mode makes it easy to check radon levels day or night, even in basements and low-light areas.
- AUTOMATIC DAILY SELF-TEST – Performs a fail-safe self-check every 24 hours to help maintain consistent operation and dependable long-term monitoring performance.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B085GLQ9F8 |
| Alarm | Audible |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #66,443 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #75 in Gas Detectors & Alarms |
| Brand | SafetySiren |
| Color | Cream |
| Customer Reviews | 4.5 4.5 out of 5 stars (493) |
| Date First Available | March 4, 2020 |
| Included Components | A/C wall adaptor |
| Item Package Quantity | 1 |
| Item Weight | 8 ounces |
| Item model number | P4SU1 |
| Manufacturer | Family Safety Products, Inc. |
| Material | ABS |
| Number of Items | 1 |
| Operating Humidity | 95 percent |
| Part Number | P4SU1 |
| Power Source | Corded Electric |
| Product Dimensions | 1.5"D x 3.5"W x 4.5"H |
| Sensor Type | Photoelectric |
| Shape | Rectangular |
| Size | 3 3/8 W x 4 5/8 L x 2 H |
| Sound Level | 85 Decibels |
| Style | Modern |
| Type of Bulb | LED |
| UPC | 758773420203 |
| Upper Temperature Rating | 104 Degrees Fahrenheit |
| Usage | indoor use only |

## Product Details

- **Alarm:** Audible
- **Brand:** SafetySiren
- **Color:** Cream
- **Item Weight:** 8 ounces
- **Operating Humidity:** 95 percent
- **Power Source:** Corded Electric
- **Product Dimensions:** 1.5"D x 3.5"W x 4.5"H
- **Sensor Type:** Photoelectric
- **Style:** Modern
- **Upper Temperature Rating:** 104 Degrees Fahrenheit

## Images

![Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA - Image 1](https://m.media-amazon.com/images/I/31-jeUbswAL.jpg)
![Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA - Image 2](https://m.media-amazon.com/images/I/317NIIHx1gL.jpg)
![Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA - Image 3](https://m.media-amazon.com/images/I/41k+WyWakXL.jpg)
![Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA - Image 4](https://m.media-amazon.com/images/I/51KfadpQa3L.jpg)
![Safety Siren Pro4 Plug-in Radon Detector, Continuous Radon Gas Monitoring with Audible & Visual Alarms | Short & Long-Term Radon Detection for Home, Office, & Other Indoor Living Areas | Made in USA - Image 5](https://m.media-amazon.com/images/I/51V-Ca4P+mL.jpg)

## Questions & Answers

**Q: How does the SafetySiren Pro4 detect radon gas?**
A: The Pro4 uses continuous alpha-particle detection to provide real-time and long-term average radon readings without waiting for lab analysis.

**Q: How often should I check or reset my radon detector?**
A: The Pro4 works seamlessly - just plug it in and let it continuously track radon levels with precision. Reset readings anytime to monitor both short-term and long-term exposure with ease.

**Q: Does SafetySiren require lab tests or monthly fees?**
A: No. The Pro4 delivers accurate, on-the-spot radon readings - no mailing samples, lab fees, or subscriptions ever required.

**Q: Why choose SafetySiren over other radon detectors?**
A: Proudly engineered and made in the USA for over 25 years, SafetySiren offers professional-grade accuracy, lifetime reliability, and affordable protection for every home.

**Q: What’s the difference between Pro 3 and Pro 4?**
A: The Pro4 enhances the classic design with a bright backlit display, adjustable sound settings, and both visual and audio alarms, while the Pro3 provides reliable digital monitoring with standard audible alerts.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Radon Detection Device Works Well
*by R***B on January 6, 2021*

The radon detector was received in the time expected and in a bubble envelope. It is winter and the unit was allowed to warm to room temperature. Next, it was plugged into the wall outlet. An error message appeared upon initialization. Per instructions, electric power to the unit was cycled. This time the unit came up with the correct response - beeps, flashing CAL, then dashed lines for short term and long term readings in pCi/L. Per instructions, readings appeared in place of the dashed lines in 48 hours. I had placed the device in a bedroom of the house on the second floor. The initial readings were 1.8 pCi/L. This is close to one-half of the EPA action limit of 4.0 pCi/L or 148 Bq/m^3. (Each 1 pCi/L is equal to 37 Bq/m^3.) The WHO states that 2.7 pCi/L or 100 Bq/m^3 is the action level. The WHO also states that lung cancer risk will increase by 16% for every 100 Bq/m^3 of long term exposure. It is also important to remember that cancer risk is based on long-term exposure. It does not matter if the exposure was continuous or intermittent. Exposure to radon adds up over time. If you have moved from one house to another, each new exposure adds to long-term exposure. After 7 days of monitoring the radon reading fell to 1.7 pCi/L. We fully expected that the readings in our house would increase when we moved the sensor to the first floor and then to the basement. After 6 days of monitoring of the first floor near the kitchen and laundry the reading was 1.9 pCi/L. A week later the reading had fallen to 1.0 pCi/L. Thinking that there might be something wrong, we continued to monitor the reading for another week, and it steadily climbed to a maximum value of 2.5 pCi/L. That reading persisted for 3 days, and it is steadily falling again. These results show why long term monitoring is important. It is winter and the ground is beginning to freeze, although there is no snow cover. This makes the ground more, not less, permeable to radon gas. If it rains or snows, the ground becomes less permeable to radon and the gas may be less apt to dissipate into the outside air and more apt to enter the basement. The most common point of entry is the basement, but radon can also enter through windows and doors. The water content of the soil around the house, how well the basement windows are sealed, how well the basement concrete cracks and seams are sealed and concrete porosity all contribute to basement radon levels. Radon levels (if you have well water) will usually increase in the winter in a closed house where water vapor releases radon gas from laundry, dishwasher and bathing. The contribution due to evaporation of radon laden well water is added to the contribution entering the home from the basement to get the radon total. That is what is being read on the first and second floors of our home. Readings in the basement will be due to infiltration of radon through cracks in the foundation and basement slab as well as the porosity of the concrete, itself. Our well water contains nearly 4,000 pCi/L of dissolved radon. That is less than half the EPA actionable level of 10,000 pCi/L. Every 10,000 pCi/L of dissolved radon is expected to add 1.0 pCi/L to the air in the house due to dish washing, laundering and showering. We have no direct way of knowing if an additional 0.4 pCi/L has been added due to water vapor. We can assume, however that part of the dissolved radon in our well water is removed by the charcoal filter on our domestic well water supply. There is one additional note that might be added. There is no battery backup power to the unit. However, when the detector is moved to a new location, the data from the previous location will be held until the reset command is asserted with the push button on the face of the device. We have been very happy with the functionality of this device and will use it to guide us in radon mitigation decision making in the spring. If interested, the instruction manual with specifications can be found online. The manual provides sensor accuracy specifications for short and long term measurements. This is not a professional, periodically calibrated instrument. However, the accuracy should be more than adequate for determining when to call a professional. Added note, it is spring and the ground has thawed and heaved. The ground floor radon readings for the last two weeks have been between 2.2 and 2.7 pCi/L. We also have 135 days of data for our ground floor living space and the average is 2.0 pCi/L. Currently, the sensor is monitoring the basement so that a radon fan can be sized in cubic feet per minute (CFM). The bigger the fan, the more electricity it will use on a continuous basis. Most fans use between 50 and 100W. In this locale electric power is $0.20 per kW-hour. The annual operating cost would be between $88 and $175. Update: After this review was written, we installed a radon fan in our passive radon stack. Then, we caulked all of the basement slab cracks, expansion joints and basement floor-wall joints with a high quality radon caulk to improve the vacuum under the basement slab and to reduce heat loss. We also caulked around all of the basement bottom plates because there are anchors in the bottom plates that penetrate the concrete. (If you don't caulk, the radon fan will pull conditioned air right out of the house and send it up the radon stack, so please do it.) The radon level, year-round, has dropped to 1 pCi/l or less at the point in the basement room that is farthest from the radon suction point in the basement slab. In order to increase the confidence level of the measurement, we placed an Airthings Corentium Home battery operated unit near the Pro4. Although they employ different sensors and algorithms, there is good correlation between the two, and that increases our confidence level in the measurements. We purchased largest, adjustable speed Fantech radon fan that we could find, and we run it at very slow RPM. It is capable of moving a huge volume of air when turning slowly. It employs a massive Pabst fan with excellent bearings. The fan draws barely 250 mA on 115 VAC as measured with a clip-on current probe. That's 28.75 Watts. It is hardly noticeable in our monthly electric bill, maybe $3.50.

### ⭐⭐⭐⭐⭐ Testing all the houses
*by A***. on October 29, 2025*

I had the radon tested when I bought the house 20 years ago, and it was low. Since then, it has been turned into a rental, but never retested. My renters got this tester, and discovered that the long term radon levels were 2.5x above the action level. I paid for a professional test, and it returned the same result. Installed radon mitigation, and this meter showed a drop to less than 10% of the previous value. Mitigation company did their own test, and again, identical results. Bought one of my own to test my house and all the other houses. This should be an essential piece of kit for homeowners, landlords, and realtors in high radon areas. Just plug it in, and it works. Keep it away from humid environments. Wait a week for accurate results. Super easy. If you have questions, the product instructions are in perfect English.

### ⭐⭐⭐⭐⭐ As Accurate As The Professionals! Peace of Mind in a Compact Device.
*by R***J on July 13, 2025*

We had the professional 72-hour radon test done in our home (the expensive one), and we used this monitor at the same time. The results were almost identical, usually within 0.1 to 0.3 of the pro-grade equipment. That alone made this device worth it. I’ve moved it around the house (basement, bedrooms, living room) and it works reliably everywhere. We even used it before and after installing a radon mitigation system, and the readings matched the professional’s results both times. Is radon really dangerous? There’s a debate all over the internet. But with a dog in the house, I’d rather be safe than sorry. This gives me peace of mind and helps me keep an eye on air quality long-term. Simple to use, easy to read display, made in the USA, and accurate. Highly recommend.

## Frequently Bought Together

- SafetySiren Pro4 Series (4th Gen) - Leader in Home Radon Detection Since 1993. Made in The USA - USA Version pCi/L
- Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display
- Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hu/products/213562376-safety-siren-pro4-plug-in-radon-detector-continuous-radon-gas](https://www.desertcart.hu/products/213562376-safety-siren-pro4-plug-in-radon-detector-continuous-radon-gas)

---

*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-22*