Product name: Mono 100W Bluetooth audio amplifier board module Model: -1001B Power amplifier chip: TPA3116D2 Bluetooth version: 5.1 Bluetooth transmission distance: 15 meters Audio input: BluetoothandAUXandUSB stickandUSB sound card Audio output: mono 100W Adapted power supply: DC7-24V, 4A (AC is not allowed) Adapted horn: 20-100W, 3-8 Volume adjustment: volume with button, click: play or pause Double click: song Three strikes: enter or exit TWS mode Long press: turn off or on Protection mechanism: input anti-reverse connection, over-temperature, over-current, short circuit, anti-static protection Features: support Wuzhi audio app. the Bluetooth name, password settings, prompt tone volume adjustment, on or off prompt tone, sleep aid, firmware upgrade, and so on. matching function and the true wireless function make the two sets of speakers can be combined to form a left and right channel box matching, with a stronger sense of spatial positioning. Product size: 89 x 45 x 20mm color:Black Material:PCBandmetal Package Contents: 1 x amplifier board 1 x DC adapter 1 x screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.