Product description The D-Link LAN Tester can be used for testing RJ45 cables, RJ11 telephone cables and network cables. It keeps your network running smoothly by testing wrong connection, short circuit and open circuit. the two-part unit can be separated for remote closet testing. KEY FEATURES Visible LED status display. Check the RJ11& RJ45 Cable quickly. Automatically runs all tests and checks for continutiy, open,shorted and crossed wire pairs. Slow and fast test switch. SPECIFICATION Main Function: Verify RJ11, RJ45 cables Tracking Type: RJ11 & RJ45 Power: 9V Alkaline battery (battery not included) Brand : D-Link Networking Tools Type : Cable Testers