Hearing Aid Earphone Sound Amplifier 09a

1. Accessories: English instructions for host (1), batteries (3) and earplugs (3)2. Maximum output: 130 5 dB3. Sound gain: 50 5 dB4. Harmonic distortion: 10% (1000 Hz)5. Equivalent input noise level: 32dB6. Frequency range: 300-4500Hz7. Battery voltage: DC 1.5 v (one A76 button battery)