Automatically runs all tests and checks for continuity, open, shorted and crossed wire pairs. Visible LED status display. Cable state testing (2-wire): Line DC detecting, anode and cathode determination,Ringing signal detecting open, short and cross circuit testing Cable Type: RJ11 Telephone cable and RJ45 LAN cable Connectors: Ethernet Cat 5, Ethernet Cat 5e, Ethernet Cat 6, Ethernet Cat 7, RJ11 6P and RJ45 8P Power Source: DC9V Battery Required (not included)