Specifications : Model : Temeisheng W-18 Accessories: 1 carrying case, 1 microphone, 1 receiver with 6.5 jack (connects via USB port and microphone port) Operating distance: ~30m Microphone power source: AA battery (1.5V) X2 Receiver power source: Power from Speaker via USB port Battery life: 6-8 hours (Depending on Battery)