Specification: Certification: NONE Origin: Mainland China Model Number: Bluetooth-compatible Amplifier Channels: 2 (2.0) Product name: Bluetooth-compatible power amplifier Color: black Function type: 2.0 stereo Output power: 20W+20W Power requirement: 12V (not included) Impedance: 4-16 ohms Bluetooth-compatible distance: about 10m (barrier free) Bluetooth-compatible protocol: 5.0 Signal to noise ratio:>90dB Frequency: 20Hz-20KHz Distortion rate: 0.01% Audio input: RCA stereo audio, Secure Digital card, U disk, USB audio input can be connected to computer/mobile phone/OTG/tablet 0TG Product size: 125 (L) * 75 (W) * 40 (H) mm/4.9*2.95*1.6in Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Bluetooth-compatible Power Amplifier 1 x Instructions 1 x Remote Control