Check the listing for details. Mini Cable Tester LAN Cable Test Tools Networking Tool RJ45 RJ11. Condition: New. Listed at 10.53 USD. Features: brand new and high quality Easy to use, mini shape, convenient to take wherever you go, test status display and power indicator. Power supply: for DC 9V battery (not included). Protective power switch for low power consumption. Quickly and easily check cables. This compact device can be used to test the Telephone (RJ-45 RJ-11 RJ12) and most types of computer cables. Specifications: Material： Plastic Size: approx. 8x5cm/3.15x1.97in Fit for: Rj45 Rj11 Cable Power Source: DC9V Battery Required (not included) Package Includes: 1x Mini Cable Tester note: Due to the problems of lighting effects and angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.