1、Button Control: Stereo mini amplifier board, high transmission effect and stability, with button control, convenient to control volume up and down, switch on and off, etc. 2、Power Supply: This mini amplifier board uses micro 5p interface power supply, ordinary cell phone charger 5V 2A charging cable can be used (not included), convenient and fast. 3、Output Interface: Amplifier module has two sets of speaker output ports (one for left and one for right channel), and it is recommended to connect 4 ohms 5W‑50W speakers. 4、Working Mode Switching: Professional amplifier module, can freely switch CLASS AB or CLASS D working mode according to sound preference and power matching. 5、Easy To Use: Integrated power switch and volume knob, when the sound is adjusted to the minimum turn counterclockwise and hear the click sound that is off, turn clockwise to turn on. 6、Applications: Sound power amplifier board device to adjust the volume through the switch, ideal for DIY speakers. Be widely used in store solicitation, home theater, speakers, etc.