The working voltage of the power amplifier board module is DC12-18V, and it can be connected to 4-8Ω speakers, with a maximum of 2x35W stereo sound (18V4Ω). TDA7377 Digital Audio Amplifier Board 30W+30W amplifier board module with 3., 5mm/3P expansion input port dual channel stereo HIFI amplifier PCB board, suitable for 4-8 ohm speakers Note: Please connect the circuit accurately. TDA7377 Amplifier Board Jollic TDA7377 Digital Audio Amplifier Board 40Wx2 Dual Channel Stereo Bluetooth Amplifier Output power: can connect 4-8 Ω speakers, maximum 2x35W stereo (18V4 Ω), Input method: 3., 5mm input/3P extended input port Tda7377 TDA7377 2.1 Aplifier Circuit Diagra With PCB Xtronic Packaging content: 1pc * Digital power amplifier board module 3P Cable Length: 30CM, PCB size: 58., 67 * 55., 12 mm Dual channel amplifier board is equipped with a volume control that can be adjusted to the desired volume at any time and enjoy distortion-free and powerful sound The power supply should not be connected to the channel terminal, as incorrect connection may burn out the IC. Potentiometer handle opening: 7mm ATORSE® Tda7377 30W 30W Dual Channel Car Stereo Class Ab Amplifier Power supply voltage: DC12V-18V TDA7377 teljesítményerősítő tábla DC12V dupla 2.0 csatornás sztereó... 1pc * 3p audio cable , 1pc * accessories