SMSL SA-60 60*2 TPA3116 Class D Big Power HIFI Digital Desktop Amplifier Color Black with Power Supply with Tera Dust Cloth Support 2 inputs, RCA and 3.5mm headphone jack input: easily connect to PC, smart phone and audio players; with input memory function, considerate and scientific design. MCU control, easy to operate: MCU can do real-time monitoring and protection according to the working status of the machine. 360 degree rotating electronic volume control: switch on volume settings can avoid excessive damage to the louder speaker and personal safety, also can prevent imbalance and other undesirable phenomena caused by poor connection of potentiometer. Output Power: 55W + 55W (8 OHM @ 10%THD+N). Power supply: DC18V-24V.