Features: Professional UHF 630-690MHz wireless dual channel microphone system. Unique digital 16 bit ID pilot technology to avoid interface even in same frequency. Ultra-short audio latency. Audio sampling mode: 48KHz. Colorful display and humanized menu make it easy for single or multiple-sets mounting. Effective working range up to 40m / 131ft in open-area. The handheld mic can be recharged, runs on 1 * 18500 batteries(not included), and the receiver powered by the adapter. Ideal for stages, KTV rooms, conference rooms, lecture and families entertainment.