From the Manufacturer Byte Brothers tools exhibit 3 qualities: Innovation- It moves our company and our customers forward. Top quality- work requires tools that repeatedly perform. Affordable- Tools are useless unless you can afford to buy them. Byte Brothers guarantees these 3 qualities plus offers US based customer support, training and quick upgrade and warranty service. Whether you are in the dotcom, telecom, audio/video. electrical or security field, you will find Byte Brothers products designed for you at a price you can afford. Product Description The CTX590 Proton Wire is a must-have tool for those working in a Telco or network cabled environment who needs a classic, telephone-type tester to trace and locate cable ends. The same probe technology sold with 1000s of our Real World Certifiers has been expanded and coupled with a powerful, compact "classic" tone generator to create the Proton Wire Locator Kit. Features: Locate cable runs by placing a tone on one end of the cable with the tone generator and detecting the tone on the far side with the tone probe. Connections can be made to RJ11 and RJ45 jacks and to any wire pair using alligator clips. Test for continuity (shorts) and the presence of voltage (AC, DC and polarity are indicated). Circuitry allows connection to live circuits without damage. Switch selectable tone (steady or warbling). Large Red/Green LED for indicating shorts, continuity and voltage polarity. Tone Probe Features: Detects tone from the tone generator. Ultra bright LED lighted tip to see in dark closets. Safety LED indicates "60HZ present". "Tone present" LED lights to aid in noisy environments. Insulated tip stops accidental shorts when probing punch down blocks. Volume control. Includes: Pouch and 9V (2) batteries.