Description: Using TPA3116D2 as the chip, a single power supply 8-25V DC wide working voltage, maximum 50W (left channel) + 50W (right channel) two-channel output. Digital amplifier can do the standard mono amplifier board can also do subwoofer amplifier board,with a amp NE5532 buffer matching. You can use switching power supply, laptop power supply, battery or vehicle power supply and so on. Name: Digital Audio Amplifier Work efficiency: Up to 90% Power supply interface:Standard 5.5MM power Specification: Material: Plastic Output Power: 100W*1 Number of Channels: mono Size Chart: Size: Approx. 9.8x6.2cm/3.86x2.44inch Package Includes: 1 Piece Digital Amplifier Board Note: Normal operation is the first external power supply and digital power amplifier connected to the power port, then go to the external power supply 220V power cord into the power outlet. Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.