This kit includes the tools necessary to tone and trace wires in common wiring systems. This premium tone generator has Angled Bed of Nails (ABN) clips that securely grip the cable. Tone Generator emits five distinct tones. An RJ11 plug easily connects to telephone or RJ45 data jacks for toning. The toner, also checks continuity and polarity that are indicated by clearly labeled LEDs. The probe traces with the tones signal. The adjustable-volume speaker amplifies the tone. The 3.5 mm jack allows for headphones (sold separately) to be attached in noisy environments. The probe has a tool-less non-metallic durable replaceable tip. The probe enables testing in distribution blocks without disturbing other services. Includes Tone Generator and Wire Tracing Probe. Toner features 5 tone cadences. Probe features a work light for use in dark spaces. Probe-Pro features 3.5 mm headphone jack for noisy environments (headphones not included). Responsive probe with durable non-metallic, replaceable conductive tip (VDV999-068) - sold separately. Work light on probe tip for use in dark spaces. Terminal block on probe to confirm the toned pair. Each tool includes 4X AAA batteries. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.