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: 4.63.6.09 cm
Net Weight: 7 g (without Battery)
Special Function Key: N-H