Mini Hearing Aids for Seniors with Noise Cancelling, Comfortable Lightweight Hearing Devices Sound Voice Amplifier Light Weight and Invisible - Mini hearing aids with small size 16mm and lightweight 2g, no burden for ears for long time use. This hearing aid is smaller than a pistachio, completely invisible when worn. Comfortable & Stable - Based on extensive human ear contour data studies, the design is optimized to fit the auricle for improved stability, comfort, and lightweight wear. Noise Reduction - Features a built-in intelligent noise reduction chip that delivers natural sound quality. Easy To Operate - Simple operation for seniors: insert the battery, switch the on/off button, and adjust volume using the rotary control. Durable Battery Hearing Aids - Equipped with replaceable A10 zinc-air batteries, providing up to 72–96 hours of continuous use. Specifications: 1. OSPL90: 112dB ±3dB 2. Output sound pressure level (high-frequency average): 108dB ±4dB 3. Full range sound gain (maximum): 35dB ±5dB 4. Full range sound gain (average): 30dB ±5dB 5. Equivalent input noise level: 29dB ±3dB 6. Frequency response range: 400Hz–4600Hz 7. Total harmonic distortion: 10% 8. Battery type: A10/PR536 (zinc-air), Capacity: 95mAh 9. Rated power supply current consumption: 2.5mA Size: 1.6 x 1.6 x 1 cm Package Includes: 1 Pc Hearing Aid