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 Registered Protection - if critical components are damaged and ground fault protection is lost, power to the receptacle is disconnected. Visual LED power identification of receptacles to ensure proper functionality for necessary loads. For detailed Tamper-Resistant receptacle information, visit our Tamper-Resistant Receptacles page.