Advanced bi-directional sensing technology;Superior sensitivity and functionality providing for accurate tracing and locating;Ergonomic receiver with information-rich full-color graphical LCD;Visuals and audible signal provide quick and easy to understand tracing feedback;Allows linemen to trace concealed wiring, locate junction boxes, and find breakers for live or open circuits;Locates and identifies blown fuses;Finds shorts and breaks in conductors;Low pitch, high volume easy to hear audible indicator;User-selectable automatic or manual gain capability for fast, convenient use;Can be used on GFCI protected circuits;Measurement tool supports transmitter-to-receiver distances up to 4 miles for closed circuit tracing;Lifetime Limited Warranty