Test-Um TP500 LanRoamer CAT5 Tester Designed Exclusively For Wiring Environments Found In Home Networking & Home Automation Auto-On & Auto-OffWhen Testing Cables, Just Plug Both Ends Into Tester Snap-Together Case For Easy Storage & Convenient Patch Cable Testing Tone Generator Mode For Use With Tone Tracers Debug Mode With From/To & Failures For Each Pair