Features: Aluminum alloy body, thick, feel is also very good. Mini HIFI audio power amplifier. Internal 5.0 Bluetooth version module. Low distortion supplies a clearer, stronger and more powerful sound. Two main channel output, left and right channel outputs are interfaces for speakers. Large knobs are designed with blue led lights to make the products more beautiful. Specification: Input voltage: DC12V Current requirement: above 2A Product power port: 2.1X5.5mm Frequency Response: 20Hz - 20KHz Out Power: 2 x 20W Impedance: 4 - 8Ω Signal To Noise Ratio: 85dB Audio Sensitivity: 0.25mv-50mv Number of Channels: 2 Material: aluminum alloy Color: Black Package Contents: 1 x Power Amplifier