model: AK370 model (Bluetooth)Note: If you want to use as a home amplifier, you need to buy a 220V to 12V (2A-5A) switching power adapter.Specifications:Color :BalckMaterial: Aluminum alloyDimensions :125X75X40MMBluetooth support:Input voltage :dc 12V/ AC 220VRMS power :20W+20WMax power :200W+200WChannel :2CHLoad impedance :4-16 ohmsSNR :> 90dbFrequency :20Hz-20KHzDistortion rate :0.01%Features:Mini high fidelity digital Bluetooth audio power amplifier.Aluminum alloy body - Aluminum alloy, durable, the body is made of aluminum alloy one-time, anodic surface treatment, general atmosphere, thick, feel also very good.- Support SD card, U disk, AUX input, MP3 format playback, support Bluetooth wireless connection.- Support FM stereo radio.- Low distortion provides clearer, stronger, more powerful sound.- With remote control function.- Two main channel outputs.- This machine supports Bluetooth operation and line input.