Feature: 1. CABLE FINDER: RJ11 and RJ45 cables can be found through the transmitter. It is simple and fast to find the line without peeling off the offline skin. 2. CABLE CHECKING: The tester can detect the wiring sequence, open circuit, short circuit, wrong pair and reverse connection of network lines. 3. WIRE TRACK: The cable tester can be used for wire tracking, checking short circuit, locating open circuit and wire identification. 4. LED INDICATOR: The transmitter and receiver LEDs indicate an open or short circuit condition. You can quickly monitor the situation and make adjustments. 5. EASY CARRYING: Comes with a small size and light weight as well, the cable tester can be easily taken with you to help with your work. Specification: Item Type: RJ11 RJ45 Line Finder Material: ABS Transmitter Battery: 9V 6F22 battery x 1 (transmitter is shipped without battery) Receiver Battery: 9V 6F22 battery x 1 (receiver is shipped without battery) Working Temperature: 0 to 40 ℃ Storage Temperature: - 10 to 50 ℃ Protection Grade: IP40 Analog Track is about Approx. 3000m / 9842.5ft, and digital track is about Approx. 300m / 984.3ft Safety Level: IEC61010 1600V CAT III Functions: Analog trace, digital signal trace, cable sorting. Package List: 1 x Transmitter1 x Receiver1 x Cloth Bag1 x RJ11 Connector Clip1 x RJ45 Connector Network Cable1 x Manual