Supports USB5V voltages input, can use adapter, computer USB port and more as power sources. 3.5mm headphone port is for sound output and can use with regular 3.5mm headphones or connection to external amplifier devices. Supports signals input, amplifier output double channel, with a spacing of 1.25-4P. The potentiometer adopts button, 3 in 1 function, and combines brightness. Driver board, automatic recognition, automatic conversion.