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 2 x AAA batteries (included). Three buttons provide an intuitive user interface. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.