Features: brand new and high quality Easy to use, mini shape, convenient to take wherever you go, test display and power Power supply: for DC 9V (not included). Protective power for low power consumption. Quickly and easily check network cables. This compact device can be used to test the network. 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 Network Cable Power Source: DC9V Required (not included) Package Includes: 1x Mini Network Cable Tester note: Due to the problems of lighting effects and shooting angles, there will tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.