Feature:1. Support up & down the song switch, play pause function.2. Built-in high quality tweeter.3. Support remote control volume adjustment & manual volume adjustment. Specification: Input voltage: AC110-240 volts Scope of application: Home Function: TF / U disk / bluetooth / AUX (external audio player) Maximum power: 220 W Impedance: 4 Euro Sensitivity: 75-90DBDistortion: 0.01% (people can hardly hear it) Speaker: Push 6 inch, 8 inch, 10 inch Treble: No Limit Package Included:1 X Car Amplifier Board 1 X The remote control 1 X Cable line