This is a Murr Elektronik MiniMOS 30/4 D+ Power Supply. It is a switched mode power supply with a maximum output of 30W and an input voltage that can range from 85-264 VAC. It features overload, overvoltage and overtemperature protection, as well as short-circuit proof and polarity protection, making it a robust and reliable power supply. It is also certified to UL/EN/IEC 60950-1, UL/EN/IEC 62368-1, and EN/IEC 60601-1 standards, making it suitable for a wide range of applications.