The power supply transformer raises or lowers the voltage as needed . Most devices require stepped down voltage from standard AC outlets, which output 100 to 240 volts, to a much lower amount. Some transformers, however, will step up the voltage and isolate the incoming and outgoing circuits. Features: Great Switching Power Supply for Home Appliances Design with Built-in EMI Filter, Improve Signal Precision. Approvals: 3C/FC/ CE EMC Standards: According with GB9254, EN55022 class A, EN61347-2-13:2008 Standards Certifications: CE & RoHS Meet CEC Energy Efficiency Level IV. Power LED Monitor (LED Glow when in Use) Category - Switch Mode Power Adaptor (SMPS) MTBF >50,000 hours IN-DOOR USE ONLY! This Power Supply Unit "DOES NOT" comes with an installation instruction, wiring cable, on/off switch, or screws. The professional installation of a qualified electrician is highly recommended. PLEASE NOTE THAT DESIGN AND COLOR MAY CHANGE FROM THE PICTURE SHOWN ABOVE Specification: Input Voltage : AC 90 - 264V 50 / 60Hz Output Voltage : 12V DC, 15A, and 180Watt Output Voltage : Adjustment Range: ±20% Output Voltage Type - DC Current Shell Material : Metal Case / Aluminum Base Color : Silver Weight: 700g Approx. Dimension : 200 x 99 x 41mm Approx. Uses: Power supply for electronics projects Industrial equipment and machinery LED lighting systems CCTV and security systems DIY and hobbyist electronics Package Includes: 1 x 12 Volt 15 Amp Power Supply Transformer SMPS