Model SDR Technology CPU based Circuit+C.R.G.O transformer Input Input Voltage Range 140-260Vac/70-140Vac Input Frequency 50/60Hz Output Output Voltage 220Vac/120Vac Output Precision ±8%/10% Efficiency 98% Phase Single Phase Digita LED Display Status Input Voltage/Output Voltage LED Display Status Green LED Device on Yellow LED Delay in progress Red LED Output suppressed,Input voltage out of range and overheating Protection High Voltage Protection Yes Low Voltage Protection Yes Overload Protection Yes High Temperature Protection Yes Circuit Protection Circuit Breaker Smart Cooling System N/A Safety Standards CE,EN 60950,EN55024 Operating Conditions Operating Temperature 0-40°C Storage Temperature -15-45℃ Operating Relative Humidity 10%RH-102%RH,Non-condensing .