Product Name: 2.1 channel TPA3116D2 Bluetooth amplifier
AMP Chip: 2*TPA3116D2
Max Output Power: 2*50W+100W
Power Supply: DC19~24V
Channels: 2.1
Output Impedance: 2~8ohm
Working Type: Class D
Audio Input: RCA / Bluetooth  / USB / OPT / COAX
USB File: MP3,WMA,WAV,16B1T 44.1KHZ-48KHZ

Notes:
1.The output of the power amplifier board can only be connected to passive speakers, not active speakers and constant pressure speakers. 
2.The power amplifier board uses DC12V-24V power supply, the higher the voltage, the greater the power but can not exceed 24V, Otherwise, the power amplifier will be burned, and the power plug is 5.5*2.5, positive and negative inside.
3.The negative poles of the left and right channels of the power amplifier output cannot be connected together, otherwise it will cause the power amplifier to burn out. 
4.The input indicator will light up after the power amplifier is powered on, press the input switch key to switch different inputs, Bluetooth connection needs to switch to Bluetooth mode to search out Bluetooth, the Bluetooth name is "YJHIFI". 
5.U disk playback supports MP3, WMA, WAV format 44.1KHZ-48KHZ, 16BIT.