IN-DOOR USE ONLY!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.Widely used in Industrial automation、 LED display、 communications、 etc.Specification : Size : 11 x 7.7 x 3.6cmInput Voltage : 110V/220V ¡À15%Output Voltage : 12V DCOutput Current : 0 - 3.2AShell Material : Metal case / Aluminum baseProtection : Shortage Protection、 Overload Protection、 Over Voltage ProtectionSafety Compliance : CCC/ FCC / CEWorking Temperature : 0 - 40¡æStorage Temperature : -20 - 60¡æAmbient Humidity : 0 - 95% Non-CondensationHow 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¡Á60LEDs/m=12W/m、 40W(this listing)¡Â12W/m=3.33m、 So、 Support the LED Strip(60LEDs/m、 0.2W/LED) Length (Max)=3.33MPackage Included : 1 x 12V 3.2A 40W Switch Power Supply Driver For LED Strip light