Efficiency is >87% minimum. All models feature LED power on indicator and over current and over voltage protection. Safety approvals include UL/cUL60950, TUV/GS(EN60950), CB & CCC. EMI/EMC conforms to CISPR22’B’, FCC Part 15’B’ & EN55022’B’ and all models are Limited Power Source complying with IEC60950-1 sect 2.5.