Advanced patented non-directional sensing technology. Superior sensitivity and functionality providing for accurate tracing & locating. Ergonomic receiver with information-rich full-color graphical LCD. Graphics and audible signal provide quick and easy to understand tracing feedback. Traces concealed wiring, locates junction boxes, and finds breakers for live or open circuits. Locates and identifies blown fuses. Finds shorts and breaks in conductors. Low pitch, high volume audible indicator. User-selectable automatic or manual gain capability for fast, convenient use. Can be used on GFCI protected circuits. Automatic backlight on receiver maximizes battery life. Supports transmitter-to-receiver distances up to 4 miles for closed circuit tracing. Lifetime Limited Warranty.