Trip test works like turning off the switch to save time when exiting the boat; HOWEVER, one of the mounting tabs breaks off during installation. Shows that the plastic hull is very poorly manufactured and designed for use at sea with high vibration and shock due to wave action, indicates a POTENTIAL catastrophic failure that can occur at the most inopportune moment due to the destruction of the CKT BRK HULL! I would find another product if RELIABILITY is important.