Features: Smart switch power supply for converting AC 110V/220V to DC 12V 240W 20A. With a switch to choose proper input voltage for use: AC 110V/220V. Safe for operating, with fuse for protection, overload protection, overvoltage protection. Selected input voltage, steady output voltage. Ideal power transformer for 3D printer. Specifications: Input Voltage: AC 110V/220V Output Voltage: DC 12V - 20A Rated power: 240W Overload protection: 105 percent - 150 percent Overvoltage protection: 105 percent - 150 percent Cooling Type: Natural Cooling Operating Ambient Temperature: -20 Deg.C - 60 Deg.C Housing Material: Aluminum Alloy & Stainless Steel Item Size: 20 * 11 * 5cm / 7.9 * 4.3 * 2in Item Weight: 606g / 21.4oz Package Size: 21 * 11.5 * 5.5cm / 8.3 * 4.5 * 2.2in Package Weight: 645g / 22.8oz