DEVOTED SERVICE: Genuine Phenyx Pro audio products come with 12-month manufacturer assurance and supportive customer service. Welcome to come to us for troubleshooting or replacement of discontinuous/defective parts. BOX CONTENTS: quad channel wireless metal receiver for long-range operation, 4 x UHF wireless handheld microphone, 1/4’’ audio cable, power adapter, 4 x antenna, 4 x anti-rolling ring, 8 x AA battery for 16hrs long hour use, user manual. STURDY BUILD, MULTICHANNEL MULTISET FEATURE: Sturdy metal builds for the wireless receiver and dynamic microphones. The cordless microphone has a cardioid dynamic cartridge for clear, robust, optimal, true sound. The 4x40 multichannel feature enables users to select different frequencies when preset frequency fails for reliable performance, allowing up to 4 systems to be used at the same time without interference. Ideal for church, wedding, karaoke, DJ gigs, public speaking, etc. AUTO SCAN FOR ANTI-INTERFERENCE FEATURE: The UHF wireless karaoke microphone system is equipped with the auto scan function, which enables the karaoke microphone wireless to search for the least interference channel to pair up with transmitters. The microfono inalambrico also has one 1/4’’ mixed output and 4 XLR separate outputs. 4 antenna design increases anti-interference ability and decreases interference between each channel. WIRELESS EXCELLENCE: 4 channel UHF wireless microphone & system with selectable frequencies. Channel 1: 538.3 - 550Mhz (40 channels). Channel 2: 554.8 - 566.5MHz. Channel 3: 571.3 - 583MHz. Channel 4: 587.8 - 599.5MHz. Employs hassle-free IR synchronization to pair up the receiver and cordless mics smoothly within seconds, with minimum dropouts, and maximum feedback rejection. Long-range operation for wireless DJ microphone system of 290ft – 328ft line of sight.