Input: 110V-220V 50/60Hz; Output: 5V DC up to 50 Amps Max; The output voltage can be regulated by ±10%, from 4.5V to 5.5V, Works with device that draws less than 50A, such as DC5V1A-50A The default input voltage is 220V, 110V/220V must be selected by switch before using to avoid damaging. Please replace the switch with the voltage appropriate for your project. High-quality raw materials, porous metal shell, good heat dissipation performance, small size, strong performance stability, only support indoor use. Make sure your device match the 5V voltage and wattage less than 250W. Please don't run it overload.The max use should be no more than 80% of the full loads,otherwise, It's cause the power supply to overheat,the service life of the power supply will be greatly shortened.We recommend you to use this 5V50A 250W power supply to power devices less than 200W. Safety features: Automatic overload cut-off, over Voltage cut-off, automatic thermal cut-off, short circuit protec