The Trakk Health Personal Hearing Amplifier is a single hearing aid designed for daily living assistance. It features a behind-the-ear fitting with digital sound processing for clear amplification. This smart ear device comes with a one-year manufacturer warranty, replaceable batteries, and includes three ear tips for a comfortable fit for both ears. Perfect for individuals looking for a reliable and user-friendly hearing amplifier to improve their hearing experience. One battery put in. Never used . My husband needed hearing aids.