The Tone Generator is a highly practical network installation and troubleshooting tool which features a single or multi-tone signal two test leads and a 4-conductor modular cable, The signal emitted by the Tone Generator can be easily traced by the Probe even when cables are in a bundle or hidden in a mess of punch down blocks or wall plates, The Tone Generator and Probe can be used to verify cable continuity identify wiring faults determine line polarity and voltage in network (Cat 5 and Coax) and modular telephone lines, The Probe is equipped with a tone amplifier and an LED indicator that detects audible frequency tones for accurate tracing and identification of wires, Features: 2-position switch for single tone or multi-tone signal, Toggle switch to control 3 modes of operation, 3-color LED indicator display for telephone line polarity continuity and voltage testing, Black and red testing leads and standard 4-pin modular cable for individual wire tests or modular jack tests, Special inductive plastic tip which prevents accidental shorts (possible with copper-tip tracers) when using near high voltage devices, Traces and identifies wires or cable in a bundle or group without damaging cable insulation, Adjustable volume level for various work environments, Both amplifier and LED for loud or dark work environments, Power switch to prevent battery drain, Convenient compact size and simple application, SKU: CTG3191