Wireless Microphone System 2 Uhf Mic Wireless Microphone System With Echo box. Cordless Handheld Dynamic Mics System: UHF wireless mic is less susceptible to interference than VHF microphone, with stable signal, no hiss, and reproduces clear, pure, low-distortion, excellent sound. The microphone wireless runs on 2 AA batteries(not included in the package) and has a long connection distance of 160 ft (50 meters). Sturdy and Durable: The metal mesh cover of the handheld wireless microphone, with good corrosion resistance. The receiver provides individual volume controls for each karaoke mic, with an adjustable echo effect. Two Input Methods: BT connection input and wired input (3.5mm jack input). Portable And Easy to Operate: When powered on, the cordless microphone will automatically pair with the receiver, the compact receiver can not only save storage space at home, but also easy to carry on the go. The receiver can be powered by the included power adapter or using a power bank. Packing List: 2wireless handheld microphone, 1receiver box, 2antiskid ring, 1RCA audio cable, 13.5mm to 3.5mm audio cable, 13.5mm to RCA cable, 1USB cable, 1power adapter, 2coaxial optical fiber, 15.5×2.1 to USB cable, 1instruction manual.