Microphone wireless system feature XLR interfaces, just plug on and turn your favorite mics into wireless mics. Adopting advanced wireless UHF technology, the signal transmission becomes more stable. Equipped with 10 groups of channels, you can switch the channel as your requirement, so as to avoid interference from other equipments. Built-in rechargeable lithium battery, support continuous working up to 3 hours, after being fully . Widely applicable for live streaming, recording studios, meeting, speaking, interviewing, karaoke, etc. wire limitations, allowing you to enjoy the fun and convenience of wireless. Transmitter Microphone Max Input: 1.5VRMs RF Carrier Frequency Range: 901m-910m Max Transmitting Power: 8dbm Working Temperature: -20-80 Working Current: 120mA Battery Capacity: 700mAh Receiver Max RF Input Signal Amplitude: 10dBm Receiving Carrier Frequency Range:90m-910m Receiving Sensitivity: -85dBm Audio : 96dB Working Temperature: -20-80 Working Current: 120mA Battery Capacity: 1500mAh Colour:black Material:plastic Package Contents: 1 x Transmitter 1 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.