Southwire Tools & Equipment M300P Professional VDV Cable Mapper, Network Cable Tester PROFESSIONAL VDV CABLE MAPPER: Quickly test voice, data and video cabling for common wiring faults including split pairs MAPS MULTIPLE CABLE RUNS: Includes RJ45 & Coax "F" ID remotes (5 of each are included) EASY TO READ: The LCD display with backlight allows you to test even in dimly lit areas DURABLE: The rugged durable molded housing with snap-in remote is impact resistant for long lasting performance and use ACCURATE READINGS: Tone generator for cable tracing (separate Amplifier Probe required) PORT COVERS: These covers protect RJ45 and RJ11 ports from dust and debris