The Klein Tools VDV500051 Tonecube Tone Generator is a tone generator for wire tracing in common wiring systems, designed for use with Klein VDV test tools VDV526-054, VDV500-060, and compatible with many other manufacturers' analog tone probes. This model features heavy duty leads with rugged dual-mode modular plug for direct connection to both RJ11 and RJ45 jacks. The VDV500-051 includes a momentary slide switch to prevent accidental operation, and offers five tone frequencies and strong power output to assist in tracing wire paths and identifying cables.