s100l portable audio stereo subwoofer amplifier bluetooth 5.0 2.1 channel power board 50wx2+100w treble bass note tuning amp

for subwoofer, small simple compact design but practical and powerful; no pop, no audible noise, dead silent when nothing is playing through it advanced circuitry design, built-in speakers protection circuit, solid aluminum chassis for long time use 1.bluetooth version: 5.0 (without sunscreen, 15 meters)
2.output channel: 2.1 channel
3.chip model: ap3050d*2 subwoofer + stereo function, which can adjust the subwoofer frequency and volume separately.separate adjustment of stereo channel treble frequency, bass frequency adjustment, volume control.syi