SX21 Smart Noise Reduction Lavalier Wireless Microphone 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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