Super handy device ensures your good mood Cable Tester for RJ11， RJ45， 10/100 Base-T and telephone cable etcAutomatic efficient scan for the miss wiring， disorder cable， open and short circuitGrounding 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 unitPowered by DC 9V reduplicated battery (not included)Protective power switch for low power consumptionHigh quality soft leather case provides more secure protection Attention: this tester should not be used to test any electrified product， or it would be damagedAs to the LED indicator not being bright， maybe the battery has run out and then please change the battery to have a try. 1 x Cable tester kit1 x Leather case1 x Users'manual