- 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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