Large Scale Central

Timers and their uses

I have two operating cars that I built some time ago. One is a radar car, where the radar antenae spins and LEDs light up on a control panel. The other is an aquarium car where a mermaid swims continuosly in a circle. At present they both run on battery power. The radar car uses a nine volt battery, while the aquarium car uses a AA cell.

I am in the process of finding ways to have these cars operate only when they pass over a track magnet. Having them run continuously drains the batteries too quickly.

I have found these timers on Ebay, and would like any electronic rocket scientists here to have a look at them. I not sure of some of the terms used. For instance, the pause time. Would that be the time the device closes the normally open contacts?

http://www.ebay.com/itm/181011745938?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648

http://www.ebay.com/itm/380498569659?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648

http://www.ebay.com/itm/221050972725?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648