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: Bluetooth+AUX+USB stick+USB sound card Audio output: mono 100W Adapted power supply: DC7-24V, 4A (AC is not allowed) Adapted horn: 20-100W, 3-8 Ω Volume adjustment: total volume with button, click: play/pause; Double click: next song; Three strikes: enter or exit mode; Long : turn off/on Protection mechanism: input anti-reverse connection, over-temperature, over-current, short circuit, anti-static protection Features: support app. Modify the Bluetooth name, password settings, prompt tone volume adjustment, on/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:PCB+metal Package Contents: 3 x amplifier board 3 x DC adapter 3 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.