Features: OXID UM-670 SET4 1 EL 1 YAKA UHF 2X100 Channel reveiver, Digital core Frequency digital synthesis. Hight-fidelity cartridge module. Infrared carrier-frequency synchronization. Super anti-jamming circuit design. Super-low background noise. Frequency auto-search(search non-interference frequency). Microphone can use with any receiver. Microphone hight-low two type power transmit, sttle for different place demand. Scope of application: conference, hight class KTV, Stage.