SODIAL(R) Mini RJ45 RJ11 Cat5 Network LAN Cable Tester with KeyChain High quality Quick and easily checks network cables Test network cable: Bare-twisted-pair and coaxial cable lines. Failure to test status: open, shor-circuit, on the contrary, cross-cutting, separation. 9 LEDs to indicate which wire whether open or not on both remote and master unit Lightweight, easy to carry and accurately identify the cable connection problem Powered by 1* 9V battery (Not included) Connector: 2 x RJ45 & 2 x RJ11