220v ac to 6v dc power adapter 1.CE,FCC,Rohs 2.over current,short curcuit ... ,no high voltage, no low voltage, no output, etc 3.Assembly full inspection: to make sure every unit with power ,without low voltage, without bad ... , etc 5.Finished products full inspection: to make sure every unit with power, no high voltage, no low voltage, no bad led indicator, low ...