Maximum sound output: 130 ± 5dB
Sound gain: ≥ 50dB
Total harmonic distortion: ≤ 5%
Frequency range: 300Hz ~ 40000Hz
Input Noise: ≤ 30 dB
Operating voltage: 1.5V
Battery model LR44
Current: ≤ 4mA
Weight: 74g

Package included:
1 x Digital Tone Hearing Aid
2 x 1.5V Battery
2 x Earplug
2 x Earplug Connector
1 x User's Manual