Description: Input: Bluetooth 4.0/RCA/3.5mm,Output: 2.1 channel (left channel + right channel + subwoofer channel) Frequency: 20HZ-20KHZ,Subwoofer cut-off point: about 180 HZ Impedance matching: 4-8 ohms Maximum output power: 50W 4ohm,25W 8ohm in left and right channel,4ohm,100W/8ohm 50W in ultra-bass channel Dynamic range: 98DB,Signal to noise ratio: 86DB,Power consumption: 0-100W Specification: Size: 132MM long X108MM deep X32MM height Package Includes: 1Piece FX-Audio XL-2.1BL Bluetooth Amplifier