Microphone: Digital Silicone Mic
Input Voltage: 5V
Battery Capacity: 70mAh
Charging Compartment Battery: 300mAh
Battery Life: 6 Hours
Signal-to-noise Ratio: 64DBM Adaptive Noise Reduction
Transmission Delay: 30MS
Sensitivity: -42DB
Frequency Response Range: 20-20KHz
Transmission Distance: Barrier-free 20m-30m
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