This Switching Power Supply 12V 30A 120W is suitable for LED lighting, lamp strips, lamps, light box modules, light emitting words. Security surveillance cameras, instrumentation, 3D printers, etc. Be sure to confirm the input and output voltage first, Factory default output voltage 110V. Technical Parameter Input: AC110V/220V 50/60Hz Output Voltage : DC 12V (Number+V x 2, -V x 2) Output Current: 30A max Output Wattage: 360W max Fix Screw Hole Diameter: 2.5mm (0.1inch) Working Storage temperature: -15 to 55degree Celsius Environmental humidity: 10-95% Material: Metal, Electronic Parts,Rugged heavy duty enclosure Safety Compliance: CCC/FCC/CE/RoHS Overload Voltage Protection Voltage consistency:There is no voltage fluctuations to speak of at power on, during transmit, receive, or at power off. 100% Full load burn-in Tested:Smart device surge protection for Short-circuit Protection, Over Temperature Protection. Low Temperature Rise,low output ripple, noise,Parallel/Redundancy Operation is possible. Note: 1.110V/220V must be selected by switch before using to avoid damaging. Please change the switch to 110V for USA. 2.The unit can work long hours at this current and good cooling environment. The actual output current depends on circuit loads. 3.Do not power the unit before wire connection and voltage adjustment, DO NOT let the unit work long hours over rated current! Work under 80% of rated currency. 4.Even with EMI/RFI filter built inside, still not suitable for a hamradio operator connecting with radio or wireless communication equipments. 5. High Voltage inside, do not remove the cover. Dust the switcher out every 2 or 3 months if necessary. 6. IN-DOOR USE ONLY! This Unit "DOES NOT" comes with installation instruction, wiring cable, on/off switch, or screws. Professional installation of qualified electrician is highly recommended.