JoyNano 240W Switching Power Supply 12V 20A AC-DC Converter Transformer for CCTV Surveillance LED Display Industrial Automation Stepper Motor and More [Upgraded Version] Converts AC voltage to 12V DC. LED Indicator. Output Current 20 Amp, Power 240 Watt. Efficiency more than 80%. Smart device surge protection for Shortage Protection, Overload Protection, Over Voltage Protection Widely used in Industrial automation, LED display, communications, CNC Stepper, etc Efficient, long life, stable, and reliable - JoyNano Quality Warranty Constant voltage output to ensure the stability of the power supply. Efficient work and low temperature. Input voltage 110V/230V is selected by switch. Before power on please check input voltage avoiding damage. Safety Protection: Overvoltage protection, short circuit protection and overload protection. Hiccup mode, recovers automatically after faulty condition is removed. Upgraded Glass-Fiber Board offers high performance of electrical insulation. Premium Transformer converts incoming line voltage to desired output load easily. Input Voltage: AC110V/ 220V Output Voltage: 12V DC Output Current: 20A Power: 240W Max Screw Terminal Number: 9 Cooling: By Built-in DC Fan . Shell material: Aluminum case Dimension: 200 x 110 x 50 mm (L x W x H) 7.8 x 4.3 x 1.9 inch Net Weight: 690g 1.5lb L, N, GND: AC power input +V: DC power output &#034;+&#034; -V: DC power output &#034;-&#034; +V / ADJ: fine adjustment of output voltage Working temperature: -10 to 50 degree Celsius Storage temperature: -20 to 60 degree Celsius Environmental humidity: 10-95% In-door use only. Professional Installation of qualified electrician is highly recommended.