The PCB board is thickened with copper foil to effectively dissipate heat, and there is no need to a heat sink to the power amplifier.DC 12V-28 wide voltage inputProvides a output of up to 45W, which can drive 5W-100 speakers, speakers, etc.Support audio cable connection, also supports Bluetooth 5.0 connectionThe Bluetooth receiver has own control buttons, which can be controlled by the buttons on the body when connected via Bluetooth (volume, play, pause, up and down, switch , etc.).Specification:Product Name: Class D 45W Bluetooth Power Amplifier Board -M314Product size: 71x52mmBluetooth version: V5.0Product parameters:Power amplifier chip parameters:Power interface: KF301 terminal blockInput voltage: DC 12V-28VInput current: more than 3APower amplifier chip: TPA3118Output power: 4 ohms 2x45W / 8 ohms 2x30W: 102Db+N: 0.1%Input interface: 3.5mm stereo input/Bluetooth 5.0 wireless connection(The function buttons are only available when using a Bluetooth connection. The buttons are when using a 3.5mm audio cable.The Bluetooth connection is when using a 3.5mm audio cable. If you to use a Bluetooth connection, you need to disconnect the 3.5MM audio cable from the amplifier.Output interface: KF301 5.0mm terminal blockBluetooth parameters:Bluetooth version: V5.0Signal-to-noise : 90DB+N:-70DBCrosstalk: -86dbDNR: 91dbTransmission protocol: A2DP/AVCTP/AVDTP/HFPTransmission distance: about 10 (the shorter the distance, the better the stability)Button control: single press to turn on/up/down, long press to turn off volume/plus/.Colour:blackMaterial:PCB + electronic componentsPackage Contents:1 x TPA3118 Bluetooth Amplifier BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.