3 kinds of input modes: with Bluetooth/AUX/Optical inputs, and equipped with AUX cable, RCA cable and Optical cable, matched well with most audio devices such as phones, tablets, TV, CD players. etc. And Bluetooth 5.0 chip can achieve low latency and up to 50ft transmission. High-performance chip & sufficient output power: Adopt TPA3221 class D audio chip, less than 0.001% distortion; and each channel can max output up to 100W, easily driving many home/desk speakers. Compact design with low heat rejection and safe to use. One knob control all functions: short press the knob can power on/off the amplifier, and long press can switch to Bluetooth/AUX/Optical inputs, rotate the knob can adjust the volume, without any complicated button, very convenient to use. Advanced design and perfect d.