Jonard Tools® Cable Mapper Pro is designed for finding and identifying issues with Coax and Networking Cables. The Cable mapper pro is the perfect tool for use on CATV Cables, Network and Satellite installations, Security and Alarm Installations, Telephone systems, AudioVideo Equipment, Coax Cables and CCTV.br br Live Voltage Detection and Continuity Testsbr Maps up to 8 Coax or Network Cables simultaneously (Up to a 1,000 FT)br The Included Tone Generator makes it quick and easy to locate cables in wiring closets or patch panelsbr Tests Coax for opens and shortsbr Tests Network and Telephone Cables for opens, shorts, splits, reversed and crossed pairsbr Protective Rubber Housingbr Requires 2 “AA” Batteries (Included) and automatically powers off after 30 minutes to conserve battery life.