Description  :  <br>12V 3.2A 40W Switch Power Supply Driver For LED Light Strip 110V\/220V <br>IN-DOOR USE ONLY!This Power Supply Unit &amp;quot;DOES NOT&amp;quot; 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.<br>Specification :  <br>Size : 11 x 7.7 x 3.6cmInput Voltage : 110V\/220V &amp;plusmn;15%Output Voltage : 12V DCOutput Current : 0 - 3.2AShell Material : Metal case \/ Aluminum baseProtection : Shortage Protection， Overload Protection， Over Voltage Protection<br>Safety Compliance : CCC\/ FCC \/ CEWorking Temperature : 0 - 40\u2103Storage Temperature : -20 - 60\u2103Ambient Humidity : 0 - 95% Non-Condensation<br>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&amp;times;60LEDs\/m=12W\/m， 40W(this listing)&amp;divide;12W\/m=3.33m， So， Support  the LED Strip(60LEDs\/m， 0.2W\/LED) Length (Max)=3.33M<br>Package Included : <br>1 x 12V 3.2A 40W Switch Power Supply Driver For LED Strip light<br>Details pictures: