Features: Professional UHF 630-690MHz wireless dual channel headset microphone system, great sound quality hand free for your better performance. Unique digital 16 bit ID pilot technology to avoid interface even in same frequency. Ultra-short audio latency. Audio sampling mode: 48KHz. The transmitter with conveniently belt clip design and volume control. Humanized display and menu make it easy for single or multiple-sets mounting. Effective working range up to 40m / 131ft in open-area. The bodypack transmitter runs on 2 * AA batteries(not included), and the receiver powered by the adapter. Ideal for stages, home party and giving a speech, presentation, public address.