... 2.Short circuit, overload protection 3.CE,FCC,ROHS USA plug 12V 1A AC/DC power adapter with CE FCC ROHS : ModelXYYY-002AXYYY ... , no low voltage, no output, etc 3. Assembly full inspection: to make sure every unit with power ,without low voltage, without bad led ... inspection after burn-in: to make sure every unit with high temperature resistance, with power ,no bomb unit, no high voltage, no low ...