TIMER SWITCH Model No. ME-9819 Basic Operating Procedure Discover Freefall System When used with the Discover Freefall System, one of the Timer Switch plugs is connected to the drop box and the other to either the Smart Timer (ME-8930) or a computer interface. When the button is pushed, a signal is sent simultaneously to the drop box and Smart Timer/Interface. This causes timing to begin at the same instant the object is released from the drop box.