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: 5# dry battery Max Working Hours with Standard Battery: 80 h Working Voltage: D.C. 1.5V Working Current: ≤4 mA Measurement: 6.8×4.2×1.8 cm Net Weight: 26 g (without Battery) Special Function Key: N-H Key
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