comments.- they are generally 3v. and always the value is written on the power plate.- you can count how many LEDs are and give it a value of 3v. by led, see if the strips are in series or in parallel.- if they are in series the voltage will be the sum of all the LEDs, if they are in parallel the voltage will only be that of a strip and what will change is the consumption, the Ampèraje in parallel adds up, so knowing how much a strip consumes you just double the current. Regards. Felipe ascencio