Right ear hearing aid. This premium quality mini invisible in ear hearing system delivers a powerful crisp and clear sound without annoying feedback and whistling. Different mode settings and controls allow you to find the best combination for your needs. The Low profile design is more comfortable to wear and barely visible. In ear hearing systems are ideal for people who wear glasses. Batteries should last 4- 7 days with normal use and when they do run out you can easily replace with common A10 batteries.