Product Features:
Checks LAN lines (RJ-45) wired to 568 A/B standard for damaging telephone line current
Tests telephone and LAN for connection to active telephone systems
Tests single line, 2 line, 3 line, or 4-line jacks to USOC (telephone) or 568 (LAN) connection
Determines if metal surfaces are live or grounded
Equipped with both RJ-11 and RJ-45 style plugs
Compact design with 4 tri-color LEDs
Self powered