Mini HIFI digital bluetooth audio power amplifier. Aluminum alloy body, durable, the body is made of aluminum alloy once, the anode surface treatment, the overall atmospheres, thick, feel is also very good. for SD Card, U disk, AUX input, MP3 format play, support bluetooth wireless connection. Supports FM stereo radio. Low distortion supplies a clearer, stronger and more powerful sound. With Remote control function. Two main channel output. The machine supports bluetooth operation, and supports line input. Model: AK370 bluetooth: Support Input voltage: DC 12V/ AC 220V(If Input voltage is AC 220V.You need use 220v transform to 12v Power Adapter) RMS power: 20W+20W Max power: 200W+200W Channel: 2CH Load impedance: 4-16 ohm : more than 90 db Frequency: 20Hz-20KHz Distortion rate: 0.01% Colour: Black Material: aluminum alloy Size: 125 x 75 x 40MM Package Contents: 1 amplifier 1 x remote control Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.