12V Trigger?

[spaceape]

Is this simple looking thing really enough too communicate with ones screen and make it go down/up when turning on/off the projector? How can two tiny wires do that, doesn't it need some sort of IR/RF transmitter?



My screen has an internal IR/RF reciever so i understand that well enough. Just not how the trigger works without being connected.

Newbie question hehe.