ENHANCED SIGNAL RELIABILITY: Harnessing the power of Auto Scan, the UHF wireless karaoke microphone system rapidly identifies the least-interference frequency to sync. This advanced feature of the wireless microphone & system increases anti-interference ability and decreases interference between each channel. The wireless DJ microphone system also has lock function to lock selected frequency. 2x100 Selectable UHF frequencies allows multiset operation of up to 16 transmitters simultaneously PREMIUM WIRELESS PERFORMANCE: Dual UHF cordless mic system with selectable frequency. Channel 1: 536.57 - 561.32 MHz (100 frequencies). Channel 2: 562.37 - 587.12 MHz (100 frequencies). The microphone wireless employs PLL frequency synthesized technology to provide hassle-free sound transmission, minimum dropouts, and maximum feedback rejection. Smooth and quick IR synchronization. Long range operation for this microfono inalambrico set of 290 ft 328 ft line of sight REFINED SOUND CLARITY: Wi