Rechargeable Hearing Aid Invisible Digital Sound Amplifier for Deafness elderlyMin Wireless ears hearing aids Powerful Product Features: Product Name:Rechargeable MiniHearing Aid 1. Long standby time (about 48-72h) 2. Safe USB Charging ( Do not need to change battery ) 3. Digital chip (Better sound quality) 4. Intelligent noise reduction 5. Anti-howling 6. Bluetooth hearing aid pls contact seller. Product parameters: 1. Material: medical - grade TPE environmentally friendly materials 2. Weight: about 3g 3. Current consumption: 1.2mA 4. Working time after being fully charged: about 48-72H 5. Maximum Output:129+4dB 6. Maximum Gain:293dB 7. Total Harmonic Distortion: 7%+3% 8. Equivalent Input Noise: 28 Packing list: Principal machine * 1 Earplugs * 4 Cleaning sweeper * 1 Charger * 1 Charger cable* 1 Charging box*1 Britzgo p ackage box * 1 there are many stock, you can place the order reassuring, will ship within 24 hours