The world's first modular hearing aid is here, and it could change the game for people with total or partial hearing loss. The hearing aid, designed for company Blamey Saunders Hears, has a shape similar to a jewel and comes in faintly glittering shades of silver, rose gold, black and white. The appearance is distinctive among hearing aids.he device works with a core, linked to an app, and is powered by a rechargeable module, which magnetically clicks into place — for anyone who's tried to change a hearing aid battery in the dark, or had to have someone else change it for them, this is pretty neat. Plus, while rechargeable batteries for hearing aids are pretty widely available now, zinc-air button disposable batteries are commonly used — and these can be super fiddly and often difficult for people with partial dexterity.