TETP-1000D is a digital tone and probe set with rechargeable battery. It is the fastest and easiest way to locate, test, and verify hard to find network cables in busy patch panels, wire bundles, and network closets. Featuring an easy-to-identify isolated digital signal perfect for testing on live networks, eliminating the need for downtime to diagnose any issues. With a long-lasting rechargeable LI-Ion battery for nonstop service.