Introducing the Model 101 Electronic bilge switch, the newest addition to the Water Witch bilge sensors. The Model 101 offers an affordable, more reliable alternative to the ordinary mechanical float switch, not to mention the fact that installation of the 101 is a nearly effortless task. So get rid of that old, unreliable float switch and go with a switch you can trust, a product backed by 20 years of experience in the marine industry.