1. This product is very suitable for DIY simple mono amplifier, with built-in boost circuit, very suitable for upgrading or making battery-powered outdoor speakers, pull-rod speakers, and mobile speakers 2. Support APP, modify Bluetooth name, password setting, prompt sound volume adjustment, on/off prompt sound, sleep music, firmware upgrade, etc. 3. Pairing function, true wireless function allows two sets of speakers to be combined into left and right channel pairing, with a stronger sense of spatial positioning 4. Protection mechanism: input anti-reverse connection, over-temperature, over-current, short circuit, anti-static protection 5. APP has a timer shutdown function Colour:black Material:PCB+Components Model: -1001U Name: 100W mono Bluetooth amplifier board module with boost and bass and treble adjustment Amplifier chip: TPA3116D2 Bluetooth version: 5.3 Bluetooth transmission distance: 15 meters Audio input: Bluetooth + AUX + U disk + USB sound card Audio output: mono 100W