SMSL Audio A2 Digital Amplifier (Black/Silver) Support 2 inputs RCA input jack and 3.5mm headphone jack input Flexible and easy to connect a variety of the latest audio equipment computers cell phones players etc. Input with memory function A multi-function machines to use MCU control easy to understand Easy operation and human computer science feature set more suitable for modern habits and personal safety protection MCU will be based on the working status of the machine real-time monitoring always protected Class-D amplifier especially design for desktop Hi-Fi system