The device uses UHF signal transmission to ensure crisp and clear sound and eliminate background noise. The receiver and transmitter have a working range of up to 50m, meeting daily needs The wireless microphone system provides 40 UHF frequencies for each lavalier microphone. High signal stability, low interference and short audio delay. Support 40 wireless lavalier microphones to be used at the same time, 40 products set channels in sequence without interference (please pair the transmitter and receiver first, and then set the channel) A wireless receiver with a 3.5mm headphone jack allows you to monitor real-time recording without delay during shooting Easy to use, first turn on the transmitter, and then long press the "and" button for 10 seconds, the LED screen will display "-" flashing cyclically. Then turn on the receiver, the blue indicator light flashes, indicating that the receiver enters the pairing state, wait a few seconds, the indicator light stops flashing, the pairing is successful Through the LED display on the transmitter, you can check the volume, battery status and frequency on the screen while working The transmitter is built-in with rechargeable 400mah lithium-ion battery, which can provide about 6 hours of working time. The 2-in-1 USB cable can charge the transmitter and receiver at the same time, and it only takes 2.5-3 hours to fully charge Specification: Type: wireless lavalier microphone Material: ABS Frequency response: 50Hz-8KHz Optional working channel: 40 Frequency range: 552.5MHz-586.5MHz Transmitter or receiver battery capacity: 400mAh