Model Name: SX21
Input voltage: 5V
Microphone battery: 110mAh
Charging compartment battery: 800mAh
Battery life: 6 hours
Signal-to-noise ratio: 64DBM
Transmission delay: 30MS
Sensitivity: -42 dB
Frequency response range: 20-20KHZ
Transmission distance: 20-30m (barrier-free)
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