Feature: 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 charged. Widely applicable for live streaming, recording studios, meeting, speaking, interviewing, karaoke, etc. Get rid of wire limitations, allowing you to enjoy the fun and convenience of wireless. Specification: Model: UR-4 – Transmitter – Microphone Max Input: 1.5VRMs RF Carrier Frequency Range: 901m-910m Max Transmitting Power: 8dbm Working Temperature: -20¡æ-80¡æ Working Current: 120mA Battery Capacity: 700mAh Transmitter Size: 9.2 * 3.1 * 2.1cm / 3.6 * 1.2 * 0.8inch Transmitter Weight: 67g / 2.4oz – Receiver – Max RF Input Signal