Features: Thickened copper foil circuit board, effective heat dissipation, no need to add heat sink to the power amplifier. 12V-28V wide voltage input. Provide high power output of up to 45W, which can push 5W-100 speakers, speakers, etc. Support audio-cable connection and bluetooth-compatible 5.0 connection. The bluetooth-compatible receiver has its own control buttons, which can be used to control the volume, playing, pause, also up and down, switch on and off, etc. when connecting via bluetooth-compatible. Specifications: Name: Class-D 45W Bluetooth-compatible Power Amplifier Board JH-M314 Size:Approx. 71x45mm/2.79x1.77inch Power Amplifier Chip Parameters: Power Interface: KF301 terminals block Input Voltage: DC12V-28V Input Current: above 3A Power Amplifier Chip: TPA3118 Output Power: 4 2x45W/8 2x30W SNR: 102Db THD+N: 0.1% Input interface: 3.5mm stereo input/BLE5.0 wireless connection(function keys are only available when using bluetooth-compatible connection. When using the 3.5mm cable to connect, the button and bluetooth-compatible connection are not available. If you want to use bluetooth-compatible connection, disconnect the 3.5mm cable of the amplifier) Output Interface: KF301 5.0mm terminals block Bluetooth-compatible Parameters: Bluetooth-compatible Version: V5.0 SNR: 90DB THD+N:-70DB Crosstalk: - 86db DNR: 91db Transmission Protocol: A2DP/AVCTP/AVDTP/HFP Transmission Distance: about 10m (the shorter the distance, the better the stability) Key-control: single press on/up/down, long press off volume/increase/decrease Note: Please allow 0-1cm error due to manual measurement. make sure you do not mind before you order. Please allow slight chromatic aberration due to different display resolutions. Package includes: 1x 45W Bluetooth-compatible Power Amplifier Board