12V 20A 240W Switch Switching Power Supply Driver For LED Strip Light 110V/220V Size: 198mm(L) x 109mm(W) x 50 mm(D) Input Voltage: 110V/220V ¡À15% Output Voltage: 12V DC Output Current: 0~20.0A Shell Material: Metal case /Aluminum base Protection: Shortage Protection, Overload Protection, Over Voltage Protection Widely used in Industrial automation, LED display, communications, etc. Working Temperature: 0¡æ~40¡æ Storage Temperature: -20¡æ~60¡æ Ambient Humidity: 0~95% Non-Condensation This Power Supply Unit "DOES NOT" come with installation instruction, wiring cable, on/off switch, or screws. Professional installation of qualified electrician is highly recommended. How to calculate Support max LED Strip Length: Assumption: Your LED Strip 60LEDs/m, and each LED 0.2W, then calculate max LED Strip Length: 0.2W/LED ¡Á 60LEDs/m=12W/m, 60W(this listing)¡Â12W/m=5m, So, Support the LED Strip(60LEDs/m, 0.2W/LED) Length (Max)=5M Package included: 1 x 12V 20A 240W Switch Switching Power Supply Driver For LED Strip Light 110V/220V