Power Supply : DC18-36V/above 10A Bluetooth Version : BT5.1 Audio Channel : 2.1 channel Audio Input : Bluetooth+AUX+USB Flash Disk+USB sound card Audio Output : Left and right channels + subwoofer Frequency Range : 20HZ--20KHZ L&R channel maximum output power (PMPO): 220W/3?--36VDC;175W/4?--36VDC;100W/8?--36VDC Subwoofer maximum output power(PMPO) : 355W/2?--36VDC;250W/3?--36VDC;195W/4?--36VDC Protection mechanism : Overvoltage, undervoltage, clipping, short circuit, overheating, etc. Unique function: support APP, modify bluetooth name, set bluetooth password Volume Adjustment : High-end encoder knob adjustment, smooth feel