Features: Wireless microphone system with 1 lapel clip-on microphone, 1 body pack transmitter and 1 mini receiver. 600-690MHZ UHF wide band frequency, stable transmission and low distortion. 48 selected channels and 48 random ID, strong ability of anti-interference. The receiver with 6.35mm(1/4) connector, you can connect it to your speakers or amplifiers easily. Max. effective transmission range in open area is about 30 meters, suitable for public speech, classroom teaching, business meeting, etc.