The Triplett Line-Bug™ 4 is a simple tester to determine if there is damaging line current on RJ-11 and RJ-45 lines.
FEATURES
Protect your expensive LAN tester checks LAN Lines (RJ-45) wired to 568 A/B standard for damaging telephone line current
Has both RJ-11 and RJ-45 style plugs
Test telephone lines for loop current and polarity
1 year limited warranty