... 2.short circuit ,over voltage protection 3.Warranty:24 months wall mount 220v 120vac to 24v 12vdc power supply : Input Voltage100 ... good appearance, with right cables, etcFull inspection after burn-in: to make sure every unit with high temperature resistance, with power ,no ... , no low voltage, no bad led indicator, low ripple, with right cables , no bad ultrasonic bonding, etcVisual full inspection: ...