Model Number: SH-430URBT-4 Key Specifications/Special Features: Power supply: 110/220/230/240V AC, 1.0ABuilt-in 12V AC-5Ah rechargeable batteriesInput: one microphone input and one aux inputOutput: one aux output and two speaker outputsBuilt-in features:With Bluetooth 3.0 functionOne wireless microphone (handheld, lapel Mic or headset Mic option)With digital MP3 player record in USB/SD card1GB record 1000 minutes, 16GB record 16,000 minutesPeak of music power: 160W maximumSpeaker: two full range 4Ω6.5" speakersTHD: <5%Wireless service range: 35m max in VHFFrequency channel: single channel (can be done in doublechannelsfor your option)Dimensions: 550x410x1150mmGross weight: 20kg