Description: This is a support Bluetooth 5.0 audio receiver Updated, with a pre-amplifier, Bass crossover Processing. With bass, left and right channel volume adjustment, treble adjustment, the total volume potentiometer control 2.1 amplifier board. Use DC power supply: 12-24V Power Supply, Maximum support 50W (left channel) +50 W (right channel) + (bass channel) three-channel output. Is the use of TPA3116D2 high-performance digital amplifier chip as the core, a parallel bridge subwoofer output, do a left and right channel output. Wide operating voltage, power-saving design, efficiency up to 90%. You can use good performance switching power supply, laptop switching power supply, you can also use the charging bottle, or car power supply and so on. Board is a good test of the finished product board is welded, according to figure connected to a good speaker, audio input or connect the Bluetooth audio device and connected to the power can be used Specification: Material: Metal, Plastic Size: 101x100x25mm/3.98x3.94x0.98inch Color: as Picture Shown Case Size: 110x100x25mm/3.98x3.94x0.98inch. Material: Acrylic , Color: Clear Package Includes: 1 Piece Digital 2.1 Audio Amplifier Board (With Bluetooth) 1 Piece Acrylic Case Note: Tips: if you need Power Supply,Please Choose this : 24V 6A Amplifier Power Supply and if you need subwoofer speaker ,Please choose: 4OHM Subwoofer