The 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 two AAA batteries instead of a button battery for more convenient replacement. Three buttons provide an intuitive user interface with simple, easy-to-identify test results.