Features and Benefits: * Locate short/open circuits and trace wires * Operates on DC voltages from 6 to 42 volts * Internally protected against power surges and overloads * 8 flexible probe allows reaching wires in congested places * Transmitter and Receiver LEDs show open or short circuit conditions Variable audio/visual signals provides fast and intuitive feedback on the circuit/wire proximity. Adjustable sensitivity for all tracing situations. No wire piercing required, non-contact technology! Tracing of wires is possible even inside bundles, conduits, behind panels, under carpets, upholstery, etc. Transmitter has auto polarity and leads with 5 amps alligator clips. Set includes: FF310T transmitter, FF310R receiver; three sizes (Mini, ATO and Maxi) blade type fuse block connectors; computer safe cordless circuit tester, foam padded polypropylene carrying case and users handbook.