The 4Mapper; Coax Tester is the easy and quick solution to troubleshoot and identify multiple coax cables Fast and easy to use the individually identified custom remotes allow you to track up to 4 connections at a time EZ 1 Button design Displays pass open or short Integrated tone generator Automatic power off Line voltage warning LED Flashing low batter LED Ultra bright high intensity LEDs easy to see in the daylight Includes 4 custom F remotes push on design Small compact fits in the palm of the hand Long battery life Made in the USA Troubleshoot identify and MAP multi-run coax cables connected to Televisions security cameras splitters monitors and routers