Wireless System Operation: Quad channel UHF wireless microphone system to enjoy cable-free operation. Metal build receiver for durability and high quality plastics component build handheld mics for light-weight feature. Individual volume control to precisely balance and adjust vocal sound. Green LED lights above each volume knob enable users visualize the pair up between receiver and transmitters. The Red LED lights would show the power ON/OFF. The Green LED lights would show the Audio signal. Stable fixed UHF signal ensures unsurpassed interference-free distortion-free operation operating distance is up to about 300ft line of sight in open space. Simple and easy to use: Easy setup wireless microphone system and convenient operation with ON/OFF switch on cordless mic. Metal receiver have 4 independent XLR outputs and one 1/4 mixer audio output jack to connect to your amplifier mixer or other PA system. List in the pacakge( 4 Bodypack option): 1x UHF wireless receiver 4x Lavalier microphones 4x Headset microphones 4x Bodypack 1x 1/4 audio cable 1x AC/DC power adapter 1x user manual(English)