





🔥 Stay warm, stay connected — the ultimate power duo for your outdoor adventures!
The Tomus-UNI OT-31 Magnetic Twins Hand Warmer is a rechargeable, dual-unit electric hand warmer with an 8000mAh lithium-ion battery. Featuring 3 adjustable heat levels (95-131°F), a sleek aluminum pebble design, and magnetic connectivity to prevent loss, it doubles as a power bank and is perfect for outdoor sports, camping, and gifting.







| Brand | Tomus-UNI |
| Color | White+Black |
| Material | Aluminum Metal |
| Battery Description | Lithium-Ion |
| Battery Capacity | 4000 Milliamp Hours |
| Included Components | Battery pack |
| Lower Temperature Rating | 95 Degrees Fahrenheit |
| Reusability | Rechargeable |
| Upper Temperature Rating | 131 Degrees Fahrenheit |
| Power Source | Hand,Electric |
| Manufacturer | DONGGUAN HONGYUTAI ELECTRONIC CO.,LTD. |
| UPC | 795890484336 |
| Item Package Dimensions L x W x H | 6.46 x 4.09 x 2.05 inches |
| Package Weight | 0.37 Kilograms |
| Brand Name | Tomus-UNI |
| Warranty Description | one year Warranty |
| Model Name | OT-31 |
| Suggested Users | unisex-teen |
| Part Number | OT-31 |
| Hand Orientation | Ambidextrous |
H**S
Favorite hand warmers.
Great for winter. Fit nicely in palm. Least a long time on one charge. Light weight. Bought one for my mom for Christmas and she loves it. Also, got myself one. Different colors to choose from.
R**Y
The wife loves them.
Heats up quickly and stays warm a long time.
K**E
GREAT GIFT!
I got this as a gift for one of my friends! She LOVES them! She keeps them in her pocket and says they get so hot. She likes how they fit perfectly in her hand and how easy it is to charge them. She said one time they got so hot she thought she was going to burn herself.
R**N
Nice little handwarmers
First what I like a lot:The handwarmers themselves feel good in the hand, are not too heavy, seem well-made, are rechargeable and the 2 heat settings seem like they will work well for most situations. The lowest heat can be used with bare hands if needed, while the higher heat will work best when you are wearing gloves or mittens as it's too hot for bare skin for any length of time when fully heated. (Disclaimer: it's not yet brutally cold where I live so I have not tested these in extreme outdoor conditions yet. Also, I have not used them for more than an hour at a time, so I can't speak to the battery longevity.) I also like that they give you a small pouch to keep the handwarmers and chargers and instructions together when not in use.Now what needs improvement:1) The instructions! I read every word on the teeny tiny instruction sheet, some with the help of a magnifying glass. Not only are they hard to read, there are some things that I can't make heads nor tails of, such as something called the "protective function". After reading that section a couple of times, I just gave up and figured it was stuff I didn't need to know anyway. Also, the instructions state that they "are not waterproof to be used in rainy or snowing day". Hello? If you couldn't really use them on a snowy day, what good would they be? What they really mean to say is just don't submerge in water as it would short them out. This is a classic case of instructions being written by someone whose first language is not English, and they haven't bothered to have a true English speaker proof the copy.2) These come with little hanging ropes to attach to the units. This is actually a good idea, for storage or for attaching loosely to your wrists while using for a little extra insurance not to lose one on the trail. However, be warned that getting them attached to the units is NOT easy. There was no reference to these little ropes in the instructions other than mentioning them in the list of items included in the box. After looking everything over very closely, there was just one specific place where the ropes could attach, so I needed to thread the loop into this one little hole and push it through to a second little hole, then tie up the loop. Sounds simple BUT it wasn't. I pushed and pulled and worked on the first one for quite some time trying to get it to slide through to the second hole. Wouldn't go. Checked everything over again, kept trying, kept trying... finally went and found a safety pin and used it to "grab" the end of the loop and pull it through. Even that took a few tries and loosened the fibers on the loop in so doing, but I FINALLY got it. Now that I knew it would actually work, and how to do it, I turned to the second handwarmer and decided to time myself. It still took me 9 minutes to get the second rope onto the other handwarmer! The good news is that now I never need to deal with that again, so while it was very frustrating at the time, it was once and done. If I had to do that regularly these would have gone straight back. Most people are not are relentless as I am, and probably would have just thrown the loops away. There has to be a better way.3) The use of these is not exactly intuitive, as there is a light ring that flashes either green or blue when in use or when charging. Reading the instructions (which call these "breathing lights", whatever that means?), you learn that green is lower heat and blue is higher. And when charging, the green light just flashes until it's charged, then just stays green. I figured that out by trial and error since the instructions don't tell you that - they simply mention a red light to warn of low battery, which I have not seen yet given my light usage.Overall, the handwarmers themselves are very nice once you wade through the instructions and get the loops on and figure out how they actually work. Which is quite simple: on low, on high, off and charge is all there is to it. But don’t lose the instructions, because as I said, usage is not intuitive and you or another user might need to refer to them occasionally in future years.
K**7
Very happy with these
Bought 4 sets for my family. With 2 teens that play softball and 1 in hockey, we were hoping for something to help warm us up. These were great. Get warm very quickly. The highest setting gives off great heat. We are currently testing how long the hottest setting lasts for and we are already over 30 minutes. Very happy with the purchase.
N**5
Excellent product!
The media could not be loaded. I purchased these rechargeable hand-warmers (2-pack) back in October 2022. I have been using them over the winter season two to three times a month as I stand outside in the elements for up to two hours at a time. I thought I’d wait until the winter is essentially over before doing this review, to really test them out.I am not disappointed! They do exactly what they are supposed to do… they keep your hands warm during cold weather!One of the best things about these hand warmers is their ease of use. They have a simple on/off switch that allows you to easily activate them when you need them. The compact lightweight design, makes them easy to carry and hold.They give off a consistent and comfortable warmth that lasts for hours. It has the adjustable heat settings to easily adjust the temperature to your desired level of warmth. Keep them in your pocket and hold them for a minute or two and your hands are toasty warm, or just keep them inside your gloves on low heat. I also love the detachable string holders and little carry bag.I was particularly keen to see if the Battery life held up. After using for two hours, there was no reduction in battery life. I kept them in my car to use two more times and the battery was still on full, which is impressive. I recharged (topped up) after the third use. When it's time to recharge the battery, you simply plug the hand warmer into a USB port or wall outlet and let it charge up for your next use.For the price, I think it is a great investment. I foresee using these every winter for years to come. They are so much better than having to buy the single-use hand-warmers which you have to discard – not great for the environment! Even if you are on a tight budget and have to be out in the cold weather during the winter months for long periods, these are worth the investment.Overall, one of my best purchases for the 2022/23 winter season.
S**4
Meh...
I'm sure these work great but I found them hard to figure out to use. I felt like I was playing a bop it. Also, they are really big.
M**.
Great !!!....but....
These are great hand warmers.However, after the 1st time using them, it seems like one of them now doesn't get as hot as the other, while on the 1st setting.Not sure why.Had to mark it with a sharpie so as to see if it was the same one having the issue. It was.It will eventually get up to the same temp as the other, but it will take over 10-15 mins, or if I "cheat", by setting it to Level 2 until it gets up to temp, then bring it back down.It has been great, so far, in Chicago's sub-zero.days.Have used them in mittens, gloves, and pockets (winter coats, soft and hard shell jackets, and in the kangaroo pocket of my hoodie/sweatshirts).
Trustpilot
1 month ago
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