The RIDGID SeekTech ST-510 includes the 10-Watt line transmitter to energize metallic lines for tracing, carry handle and extendable strap for sweeps, ground spike and 2 ft. to 25 ft. of coiled lead with heavy-duty clamps. The SeekTech ST-510 locator uses 3-connection methods: Direct Connection, Induction Method with SeekTech Inductive Signal Clamp 20973 (Sold Separately), surface induction (align lines on the unit with the pipe in the ground). Buttons, LCD display, LED indicator lights and audio feedback show impedance, resistance and wattage output, speed operation and confirms a good circuit before beginning a trace. Ideal for a pipeline, water supply, cast iron or large diameter hydrants and services. The extra wattage makes your life easier. The ST-510 Line tracer works in direct connect mode with these frequencies: 128 Hz, 1 kHz, 8 kHz, 33 kHz and 93 kHz and induction method with these frequencies: 1 kHz, 8 kHz, 33 kHz, 262 kHz. The underground line locator is compatible with competitive equipment as well. on the unit to set the frequencies (1, 8, 33, 262 kHz) set induction, and control the power button and power output (low is 1/2-Watt, medium is 2-Watt and high is 5-Watt). Can simultaneously transmit 2-frequencies at one time. The transmitter is to be used with a compatible receiver such as the SeekTech SR-20 or SR-60.