• Protect your expensive LAN tester — checks LAN Lines (RJ-45) wired to 568 A/B and USOC standards for damaging telephone line voltage
• Has both RJ-11 and RJ-45 style plugs for testing 1-, 2-, 3-, and 4-line jacks
• 4 Tri-color LEDS indicate Current, Polarity and Ringing/AC Volts
• 1 year warranty