I'm about to haul this into work tomorrow and install it for testing. It consists of a 5 gal bucket of topoff water with a maxijet 600. This is activated by the float switch. If the primary siwtch fails and the water raises too much, the secondary switch will cut off pump. It has a pretty red light to indicate it has power and a green light to show when the pump is on. I am using a relay and a transformer to step down the volatage running through the switch/tank. It has a window in the back so I can monitor the backup switch. Probably cost too much but it was fun to make.