1. Main unit (1) earplugs (4) battery (2) brush (1) earplug cleaning stick (1)
Plastic gift box (1) English instruction manual
2. Maximum sound output: 110±5dB
3. Sound gain: ≥30dB
4. Total harmonic distortion: ≤10%
5. Frequency range: 300 - 4000 Hz
6. Input noise: ≤40 decibels
7. Working voltage: 1.5V (AG3 button battery)
8. Working current: 4mA
