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: 1 x channel wireless metal receiver for long operation, 2 x UHF handheld microphone wireless,1 x 1/4’’ audio cable, 1 x power adapter, 2 x antenna, 2 x anti-rolling rings, 4 x AA battery for 16hrs long hour use, 1 x user manual. AUTO SCAN FEATURE AND ANTI-INTERFERENCE FEATURE: UHF wireless karaoke microphone system equips with auto scan function, which enables wireless microphone & system to search for the least interference channel to pair up with transmitters. It also has lock function to lock selected frequency. High-gain antennas increases anti-interference ability and decreases interference between each channel. STURDY BUILD, MULTICHANNEL FEATURE: Sturdy metal build for both wireless receiver and handheld microphones. The endurable microfono inalambrico is equipped with a high-quality cardioid dynamic cartridge for clear, robust optimal true sound. Full range response for great reproduction of vocal tone. The multichannel feature enables users to select frequencies when preset frequency fails for interference-free reliable performance and simultaneous multiset operation. PREMIUM WIRELESS PERFORMANCE: Dual UHF cordless microphone system with selectable frequency. Channel 1: 538.3 - 566.5Mhz (100 channels). Channel 2: 571.3 - 599.5MHz (100 channels). 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.