KLEIN TOOLS VDV526-200 LAN Scout Jr. 2 Cable Tester tests installed or loose data (CAT 5e, CAT 6/6A) cables terminated with RJ45 connectors. It also, tones cables with multiple tone frequencies. The larger display is backlit for easier reading in low lit areas. This model uses 2 x AAA batteries (included). Three buttons provide an intuitive user interface.