Aluminum metal shell: Comfortable texture, mini . Decorate casually without occupying space USB/T memory card playback: (supports MP3 format, lossless music APE FLAC,WMA); Radio function: FM87.5-108Mhz electronic frequency modulation AUX/ stereo input: CD/computer/MP3/phone connection. Matching multiple audio cable ports 2.0 channel output: more stunning stereo live effects; Built in V5.0 version Bluetooth: Matching tablets/phones with projectors via wireless connection is more convenient (straight distance of 10 meters) Digital display screen: intuitive display of working mode, playback time, broadcast frequency, etc; Special single loop playback control: freely select a single, loop all tracks;Equipped with infrared remote control: Control product switch, mute, play tracks, play mode, as well as direct song selection, volume size and other functions Notice: If it is used in a car (12V voltage), please use the car lighter power supply. Connecting to the car battery cause noise. If it is used in a truck (24V voltage), you need to use a step-down device to reduce the voltage to 12V before it can be used. Otherwise, the power amplifier be burned out. If it is for household use, please use a 12V 2A-5A power adapter. Channel: 2CH RMS Power: 20W x 2 Max Power: 200W x 2 Input power Voltage:DC12-18V 3A 2.0Channel sound output Speaker impedance:4-8Ω Frequency response:20-20KHz Minimum :Less than 0.4% SNR: 85dB Iinput Sensitivity:270mV Intput Impedance:47Kohm USB/MMC play function Electronic volume control /AUX input FM frequency Rang 87.5-108Mhz Infrared Remoter control Internal High-puality Bluttooth V5.0 Colour:Silver Black Material:Aluminum Alloy Package Contents: 1 x Digital Audio Power Amplifier 1 x Remote Control 1 x Cable Only the above package content, other products are not included. Note: Light reflection 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.