which replacement domes work with these?

I don't think anyone can tell you which will work for you. It all seems to depend on the configuration of your specific ear canal. The purpose of the dome is to "seal" the space around the outer edge of the hearing aid as it sits in your ear canal, and we are all different in that regard. That is the reason hearing aid companies will normally send at least 4 or 5 different size and types of domes along with the hearing aid that you may decide to purchase. When the hearing aid arrives, the wearer just has to try each one and also adjust and readjust power ranges with each until, hopefully, one combination will give the performance that it desired. With my most recent hearing aid purchase, NONE of the domes that came with the hearing aid would work with my ear. I could not get rid of the feedback squeal, no matter which one of the provided domes I tried. Finally, I decided to try the dome from an old, discarded hearing aid which had stopped working, and THAT one works for me!! It can be a real frustrating experience to find the dome that will work for you, but try to have patience. Good luck!

What size wax guard is used for this hearing aid?

Amazon sells the correct replacement wax guard for this aid.

What is the warranty?

I believe it's for 1 year....I bought an additional 3 year warranty extension for $5.99. Love it!!

Can this be returned?

yes I would think so there is a date you can return by on your invoice

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Description

👂 Hear Life’s Details, Invisibly & Effortlessly

DISCREET SLEEK - Miniature design fits invisibly in your ear canal for confident, everyday wear.
CRYSTAL CLEAR AUDIO - Advanced programmable enhancer delivers natural, crisp sound with adjustable volume control.
VERSATILE USE CASES - Ideal for TV, outdoor walks, busy environments, and even hunting—stay connected everywhere.
DOCTOR RECOMMENDED AID - Designed for mild to moderate hearing loss as an affordable, reliable alternative to custom devices.
EFFORTLESS MAINTENANCE - Includes cleaning tools and multiple ear domes for a perfect, comfortable fit and easy upkeep.

The Brefonak Seniors Adults Noise-Cancelling Hearing Amplifier is a compact, in-ear device powered by a zinc-air battery, designed to discreetly enhance sound clarity for mild to moderate hearing loss. Featuring advanced programmable sound technology, multiple ear dome sizes, and included cleaning tools, it offers a comfortable, customizable fit and easy maintenance. Perfect for everyday activities like watching TV, outdoor walks, and noisy environments, this doctor-designed amplifier provides an affordable, reliable alternative to traditional hearing aids.

Specifications

Brand	Brefonak
Colour	Light Blue
Material	Plastics+Silicone
Style	In-the-ear
Model Name	F21
Power Source	Battery Powered
Special Feature	Lightweight
Battery Weight	0.01 Ounces
Fit Type	In-Ear
Number of Batteries	1 Product Specific batteries required. (included)
Compatible Devices	Other audio sources, Television
Recommended Uses For Product	Watching Television, Outdoor Activities, Noisy Environments, Hunting
Control Type	Button Control
Battery Cell Composition	Zinc
Battery Description	Zinc-Air (z10)
Rechargeable Battery Included	No
Form Factor	In-Ear
Noise Control	Sound Isolation
Outer Material	Plastic
Manufacturer	Xiamen Wenatone Medical Technology Co., Ltd.
UPC	614144999337
Department	unisex-adult
Country of Origin	USA
Item model number	F21
Product Dimensions	1.8 x 1.2 x 0.1 cm; 118 g
ASIN	B087GF5LC2

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