Cable Tester for RJ11, RJ45, 10/100 Base-T and telephone cable . etc Automatic efficient scan for the miss wiring, disorder cable, open and short circuit Grounding test available Remotely test cable up to 1000 ft in length ( remote kit included ) 9 LEDs to indicate which wire whether open or not on both remote and master unit Powered by DC 9V reduplicated battery (not included) Protective power switch for low power consumption High quality soft leather Case provides more secure protection Attention: this tester should not be used to test any electrified product, or it would be damaged 1 x Cable tester kit 1 x Leather Case