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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: None