Digital Personal Sound and Voice Amplifier - Pocket Sound with Single Ear and Double Ear Headphone Earbuds with Wired Connectivity Technology for Adul

1. Maximum sound output: 120 decibels

2. Sound frequency: 85 decibels

3. Sound gain: 22.8 decibels

4. Total harmonic distortion: 10%

5. Frequency range: 200-5000 Hz

6. Equivalent input noise: 30 decibels

7. Working voltage: 3V5

Power supply: 2 * AAA battery (not included)