For toning and tracing wire on non-active networks and specifically for identifying individual pairs with SmartTone™ technology. Angled bed-of-nails clips allow easy access to individual wires and the RJ11 connector is ideal for use on telephone jacks. The large loud speaker on the probe allows you to hear through drywall, wood or other enclosures to find wires quickly and easily. Tone signal can be sent up to 10 miles on most cables. External switch on generator allows selection of solid or alternating tone options, indicated with solid or flashing LEDs. Probe has adjustable volume dial control and "quick-twist" tip for easy replacement.,Free spare tip with "Pro3000 Tone and Probe Kit".