The professional series Probe-Pro Tone Tracer traces non-active wiring when used with Toner-Pro Tone Generator (VDV500-063, sold separately). It features a responsive, durable, replaceable non-metallic, conductive tip and a work light for use in dark spaces. A headphone jack allows for headphone (not included) use in extreme noise environments. The terminal block confirms the toned pair has been located. Warnings: Carefully read all instructions.; Read all safety information before using.; Do NOT use on energized circuits.; Do not use instruments if it is wet, as it could pose a shock hazard.; Do not use instruments if it is damaged in any way.; Turn off instrument and disconnect all test leads before attempting to replace batteries.; Do not open the case, other than the battery compartment.; Battery door must be in place and secure before you operate. - Features: Traces non-energized wiring when used with Toner-Pro Tone Generator (VDV500-063, sold separately); Responsive, durable, replaceable non-metallic, conductive tip; Work light for use in dark spaces; 3.5 mm headphone jack for noisy environments (headphones not included); Terminal block on probe to confirm the toned pair has been located; Tool-less, twist-and-lock replacement tip (VDV999-068) available; One push power button with power-on LED indicator - no need to hold button down; Auto power-off; Low battery indicator; 4 x AAA batteries included; Includes a loop for a lanyard; Works with Klein's Scout® Pro, Lan Scout®, Jr. and Commander™ series of testers; Worklight, Stay on Power Button; Traces open-ended, non-energized wiring when used with Toner-Pro Tone Generator (VDV500-063, sold separately); Tool-less, twist-and-lock replacement tip (Cat. No. VDV999-068) available; One push power button with power-on LED indicator with no need to hold button down - Replaced By Products: VDV999068