Features: Professional 4 channel UHF wireless handheld microphone system. High sensitivity, clear sound, great anti-interference capability. Effective working range up to 80 meters in open-area. With standard XLR balanced and 1/4 mixed output interface. Independent volume adjusting knobs for 4 channels, AF/RF indicator light. One mic run on 2 * AA batteries(not included), and supplied with a power adapter for the receiver, 1/4 audio cable. Perfect for stages, ballrooms Karaoke, families party, meeting, as well as for giving a speech, presentation, public address. Note: 1. If you purchase more than 2 sets of microphone system of the same frequency, do not use them in the same place at the same time, or the microphone system can't work normally. 2. The batteries are not included.