220v ac to 6v dc power adapter 1.CE,FCC,Rohs 2. ... no output, etc 3.Assembly full inspection: to make sure every unit with power ,without low voltage, without bad led ... .Full inspection after burn-in: to make sure every unit with high temperature resistance, with power ,no bomb unit, no high ... , etc 5.Finished products full inspection: to make sure every unit with power, no high voltage, no low voltage, ...