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 using. This hearing aids smaller than a pistachio ,completely invisible when you wear it . Comfortable & Stable - According to the study of a large number of human ear contour data, the wearing form of hearing aid is redesigned to make the hearing aid fit the auricle and make it more stable , comfortable and lighter to wear . Noise Reduction - With a built in intelligent noise reduction chip, this hearing aids provide nature sound ,share beautiful voice with your loved. Easy To Operate - Easy to operate for seniors adults ,only three steps ,put into battery first , and then switch to on /off button ,finally rotate the volume button to adjust volume level according to your requirement . Durable Battery Hearing Aids - This pair hearing aids amplifiers comes equipped with replaceable A10 Zinc air battery .it can continue use up to 72-96 hours . 1. OSPL90: 112dB+3dB 2. Output sound pressure level (high-frequency average): 108dB 4dB 3. Full range sound gain (largest gain): 35dB 5dB 4. Full range sound gain (average gain): 30dB 5dB 5. Equivalent input noise level: 29dB+3dB 6. Frequency response range: 400Hz~4600Hz 7. Total harmonic distortion: 10% 8. Environmentally friendly button type battery: A10/PR536 (one zinc air battery) Capacity: 95mAh 9. Rated power supply current consumption: 2.5mA Size: 1.6*1.6*1 cm Package Included: 1 Pc Of hearing aid