Max Sound Output: ≥120 dB
Max Sound Gain: ≥30 dB
Harmonic Wave Distortion: f<1000Hz≤10%,f>1000Hz≤4%
Frequency Range: 250～3800 Hz
Input Noise: ≤50 dB
Battery: AG5 Working Voltage dc1.5V Working Current: ≤4mA