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