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Max Sound Output: 110±5 dB
Max Sound Gain:=30 dB
Harmonic Wave Distortion: =10%
Frequency Range: 300~4000 hz
Input Noise: =30 dB
Battery: AG3 Button battery or AG312 Zinc air battery
Max Working Hours with Standard Battery: 50 h
Working Voltage: D.C. 1.5V
Working Current: =4 mA
Measurement: 1.9x1.4x1.3 cm
Net Weight: 4 g (without Battery)