Increasingly sophisticated on-board voice, data and video installations make this an essential tool for the modern boat. Instantly provides both audible and visual identification of non-energized wiring and signal strength in coax, CAT 5, audio, HDTV, phone or any non-energized wire. Nested probe and adapter plugs for bare wire, RJ-45, RJ-11, coax, CAT 5, phone and automotive-style fuse blade connections are self-contained within the unit to keep all components together during transportation or storage. Adjustable sensitivity level positively identifies a single wire when multiple wires are routed in close proximity. Operates from (2) AAA batteries (transmitter) and (4) LR44 batteries (receiver). Auto-off function extends battery life in both transmitter and receiver. Convenient belt-clip. Lifetime Warranty.