4-Channel UHF Wireless Microphone System: Four-Channel UHF Cordless Microphone Receiver and High Sensitivity Unidirectional Handheld Microphone. Provides clear, powerful, best true sound. Exceeding Expecation of Wireless Performance: The 4-channel karaoke wireless microphone set features frequencies from 520MHz to 580MHz, providing superior signal stability and eliminating unwanted distortion. The professional receiver with four wireless microphones powers on to match frequencies directly and has individual volume controls for precise vocal balance. Long-range reliable performance up to 250 feet in open space line of sight. Auto-Scan Feature & Anti-interference Function: The UHF wireless karaoke microphone system equips with auto scan function, which enables the karaoke microphone wireless to search for the least interference channel to pair up with transmitters. It can automatically connected when it is turned on, and it is plug and play. Improve noise immunity and reduce interference between channels. Versatile Use: Easy setup wireless karaoke microphone system and convenient operation with ON/MUTE/OFF switch on both cordless mic and bodypack. Separate bodypack transmitters are available for a more flexible wireless DJ microphone system. The wireless karaoke microphone set is ideal for all outdoor activities such as party, wedding, speech, conference, small gigs, karaoke. What You Get: 1 Wireless Receiver, 4 Antennas, 4 UHF Handheld Wireless Microphones, 1 Power Adapter, 1 1/4′ Audio Cable, 1 User Manual, 4 Roll Rings.