1.USB interface, and a built-in MP3 pointer is used to download the music you like to the disk and insert it into the machine, and instantly plug and play. 2.LCD display, with volume, treble and bass ,Subwoofer volume control knobs allows you to adjust the high and low frequency separately for delicate sound. 3.Wireless bluetooth, easy to connect smart phones, tablets computers and other bluetooth devices. 4.Support connection of 2 groups speakers + 1 groups Passive subwoofer Design: Car, Cool, Fun, Mini, Multifunctional, Portable Compatible with: CD/DVD/USB/SD/MP3 etc. Supports: Bluetooth, Loudspeaker, Remote Control, SD Card Music Playing Functions: AUX Function, Noise Cancelling, Songs Track, Stereo Interface: 3.5mm Audio, SD Card Slot, USB2.0 Bluetooth version: 5.0 Input voltage: 12 ~ 13.5V / 2A ~ 5 A Input current: 12V 5A power supply Max output power: 90 watts (RMS 45W * 2) SUBWOOFER output power: 68 watts Load impedance: 4-16 ohms Frequency response: 20Hz-20KHz Total Harmonic Distortion: Less than 0.1% at 1 KHz SNR: 70db Input impedance: 47K Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage: AC 220V Colour:black Material:plastic+metal Package Contents: 1 x S-188 2.1ch Mini Bluetooth Amplifier 1 x Remote Control(Not include 1X CR2025 battery) 1 x 12V/5A Power supply 1 x English User Manual 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.