Reliance Controls THP102 120-Volt GFCI Outlet Tester Plugs in simply to any 120V outlet and has GFCI trip button which, when pushed, tests standard 120V, 3-wire and GFCI outlets that are wired in series with other GFCI outlets Illuminated LEDs display determined correctness of outlet wiring Rated for 125 VAC/60 Hz/0.2-Watt and indicates correct circuit status or specific wiring errors Unique ergonomic design is easy to use Comes with a 1-year product warranty