Klein Tools VDV500-705 Tone & Probe Test and Trace KitSimple analog tone generator and wire tracing probe for open ended non active wire runs Responsive probe with durable, non metallic, conductive tip Alligator clips for unterminated wires RJ45 to RJ45 test cable Toner and probe together perform pin to pin wire map test Work light on probe tip for use in dark spaces Adjustable volume control AAA batteries (included) Replaceable test cables available (Cat. No. VDV770 855) Headphone jack for noisy