ReSound Key BTE 77
An essential BTE from ReSound's Key range
The Key BTE 77 is part of ReSound's essential Key collection and runs on size 13 batteries. It supports direct streaming and the ReSound Smart 3D app.
- Hearing loss
- For all types of hearing loss (family statement)
- Connectivity
- Direct Bluetooth Low Energy streaming from iPhone, iPad and compatible Android devices
- Style
- Behind-the-ear, size 13 battery
Disposable
Battery · Size 13
IP68
Water · rated
Who it's good for
Is Key BTE 77 right for you?
Our audiologists' guide to how this model suits different lifestyles, based on its features. Your hearing test results matter most, so we'll always confirm at your appointment.
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Everyday real world
3/5
Essential-tier automatic sound that is easy to live with.
Best for everyday → -
TV turner-uppers
4/5
Direct streaming and ReSound TV accessories, no Auracast.
Best for TV → -
Golfers and outdoors
3/5
IP68 on RIE and BTE styles, essential wind handling.
Best for golf → -
Socialites
3/5
Essential directional processing.
Best for social → -
Phone and video calls
3/5
Calls stream into both ears for clear speech, though you speak into the phone itself.
Best for calls → -
Music lovers
3/5
Streams music in stereo from your phone.
Best for music → -
Active and sporty
4/5
IP68 rated against sweat, rain and dust.
Best for active →
The interesting technical bits
What's inside
- Size 13 battery
- Natural Directionality II
- DFS Ultra II feedback control
- Noise Tracker II
- IP68 rating
About ReSound Key BTE 77
The Key BTE 77 is part of ReSound's essential Key collection and runs on size 13 batteries. It supports direct streaming and the ReSound Smart 3D app.
Specifications
From manufacturer information, checked October 2026. Battery figures vary with streaming and settings. Your audiologist will confirm the right receiver, dome and settings at your fitting.
| Brand | ReSound |
|---|---|
| Family | ReSound Key |
| Style | Behind-the-ear, size 13 battery |
| Technology levels | 4, 3, 2, 1 |
| Hearing loss range | For all types of hearing loss (family statement) |
| Power | Size 13 disposable |
| Streaming | Direct Bluetooth Low Energy streaming from iPhone, iPad and compatible Android devices |
| Auracast broadcast audio | No |
| Water and dust rating | IP68 |
| App | ReSound Smart 3D |
| Tinnitus support | Yes, but for tinnitus we recommend Signia or Rexton |
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Book a free demo of ReSound Key BTE 77
Programmed to your hearing test results, with free aftercare for life at 11 clinics across Kent & London, or at home.