Rechargeable Hearing Aids Hearing Aids For The Elderly, Specification: US Plug

Rechargeable Hearing Aids Hearing Aids For The Elderly, Specification: US Plug 1. Accessories: host (1) USB cable (1) charging base (1) brush (1) earplugs (6) English manual (1) 2. Output power: 3.6mW 3. Maximum sound output: 130 ± 4dB 4. Sound gain: 30 dB 5. Frequency range: 100--4000 Hz 6. Equivalent input noise: ≤28dB 7. Harmonic distortion: ≤6% 8. Continuous working time: ≥15 hours 9. Battery capacity: 40 mA battery is a rechargeable battery 10.Working current: ≤3 mA 11. Working voltage: 1.2V 12. Speaker impedance: 110 ohms 13. Reminder: The product is a single, not a pair