Functionality: network cable tester for checking the LAN cable (RJ-45) and ISDN cables (telephone cables RJ-11), instruction manual included. Practical: the network tester shows the results in a few seconds. Short circuit, interruption or interchanged wires are easily recognisable. It can be used to check the laid cables. Easy to use: connect one end of the cable to the main unit (master), the other to the removable unit (remote). By the way LED light up, you can easily identify the wiring problem Switchable speed: the Ethernet tester has 2 speeds (state "ON" for moderate speed, state "S" for slow speed). Dimensions: 100 x 104 x 28 mm, weight: 180 g. Box contents: 1 x network cable tester, 1 x instruction manual (please note: the 9 V block battery required for power supply is not included). We offer 18 months warranty for quality problems. Special Gift: This practical tool is perfect for Father's Day, Thanksgiving, Christmas, Halloween, Birthday or other anniversary gifts.