Usage Tips:Support Android Apple system, APP visual operation play mode volume, sound effect, up and down song control, play pause, play mode. AUX audio input Pure HIFI fever sound quality / pure and parent treble midrange is gentle and delicate / bass is surging and shocking. 2.1 channel bluetooth digital power amplifier board left and right channel high and low independent adjustment / subwoofer independent adjustment 360-degree stepless tuning. 5.0 Bluetooth version, higher mission efficiency, longer mission distance and clear sound. Made of materials for a long service life. Product name: 2.1 channel bluetooth audio power amplifier module Product model: YS-S100L Bluetooth Version: 5.0 Audio Channel: 2.1 channel Input method: Bluetooth+AUX+U disk+USB sound card Power supply: above DC5-26V/10A Audio output: left and right channels + subwoofer + 3.5mm interface stereo output Volume adjustment: high-end encoder knob adjustment, smooth feel Frequency range: 20Hz-30KHz Signal-to-noise ratio: 92dB Output power: 50W*2 (left and right channels) + 100W (subwoofer) Satellite box (left and right channels) Adapter speaker: 10W-100W/42-8Ω Subwoofer (subwoofer) Adapter speaker: 20W-200W/4Ω -8Ω Protection mechanism: electrostatic protection, overcurrent protection, short circuit protection, overheating protection Unique function: support YS Audio-APP control Colour:black Material:PCB Size:95x88x25mm Package Contents: 1 x Top Cover 1 x Lower Cover 1 x Pcb Board 1 x Screwdriver 4 x M2x5+4 Copper Column 4 x M2x18 Copper Pillars 5 x Button Cap 8 x M2x4mm Screws Only the above package content, other products are not included. Note: Light shooting 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 +/-