Towel Dispenser

Ok I need to know how a motion sensor like those found in the paper towel dispensers and where the work to acquire. I have an idea and I need a super small, which is also quiet ... in fact when something is placed under the sensor, turn the engine displacement to happen. What type of motor would I need (electricity) type of battery, etc. .. Perhaps a list of website with help and information. Thank you all!

. Well, it seems that you are looking for three things: the sensor, which activates the motor, and a "dispenser'container that the engine is.
You may have to take this problem to an electronics store or Spy Shop with a plan.

you find what you need here!