Through the following contents, you can learn more about Analog Hearing Aid:
Max Sound Output:  130 ±5 dB
Max Sound Gain:  ≥50 dB
Harmonic Wave Distortion:  ≤5‰
Frequency Range:  300~4000 hz
Input Noise:  ≤30 dB
Battery:  AG13 Button battery
Max Working Hours with Standard Battery:  70 h
Working Voltage:  D.C. 1.5V
Working Current:  ≤4 mA
Measurement:  5.3×4.4×1.0 cm
Net Weight:  9 g (without Battery)
Special Function Key:  NO