Features: 1. Stable performance: Test the cable to find problematic short circuit, open the wire, cross wire pairs and other wiring faults to keep the network running smoothly. 2. LED display: easy to read LED display display problems. 3. Handheld and portable: easy to use, no space. 4. For multi-function devices: detachable main/remote unit for multi-function devices. 5. Convenient operation: A 9V battery (not included) is required. Connect the cable to the main control unit and the remote control to test the cable for problems. Descriptions: 1. Use to test homemade Ethernet jumpers to ensure they are working properly before connecting to your device. 2. Test RJ45 cable, RJ11 telephone cable and network cable. Specifications: Size:110*100*30mm Color:white Material: plastic Connectors:  RJ-11, Ethernet Cat 5, Ethernet Cat 5e, Ethernet Cat 6, RJ11, RJ12, RJ45  Package Included: 1 x Network LAN Cable Tester Notes: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2.Please allow slight dimension difference due to different manual measurement.