About this item HIFI MONO AMPLIFIER BOARD: This Mini Bluetooth audio amplifier board is a mono channel amp with 100W rated power, designed to connect to a passive speaker (20-100W, 3-8) and requires a DC7-24V/3A power supply. This mono amplifier utilizes a TPA3116D2 chip with a distortion rate below 0.3%, and features upgraded large chips that support AAC BT decoding, APP, and TWS, ensuring low latency. TWS BOX FUNCTION: As a mono amp, this power amplifier module supports TWS BOX mode. You can use two independent Bluetooth power amplifier boards connected by TWS box function to achieve left and right channel stereo sound. MULTIPLE FUNCTION KNOB: This mini amplifier features a single multifunction knob. Turn the knob clockwise/counterclockwise to adjust the volume level. Press once to play/pause, double-click for the next song, triple-click to enter or exit TWS mode, and long press to turn on/off. BLUETOOTH 5.1 INPUTS: The Bluetooth power amplifier board supports four types of inputs: A