The new Pass & Seymour® hospital grade self-test GFCI receptacle with SafeLock™ protection conducts an automatic test every three seconds, ensuring it's always ready to protect. If the device fails the test, the indicator light flashes to signal that the GFCI should be replaced. It also has our proven SafeLock™ protection feature, if critical components are damaged and protection is lost, power to the receptacle is disconnected.