Features: Professional 4 channel UHF wireless handheld microphone system, stylish and compact design. 610-680MHz frequency range, high sensitivity, super clear sound, great anti-interference capability. Effective working range up to 80 meters in open-area. Standard XLR balanced and 1/4 mixed output interface. Independent volume adjusting knobs for 4 channels, with AF/RF indicator light. One mic run on 2 * AA batteries(not included), and the receiver powered by power adapter. Comes with a 1/4 audio cable. Perfect for stages, ballrooms Karaoke, families party, meeting, as well as for giving a speech, presentation, public address.