A Ground Fault Circuit Interrupter is a receptacle that is designed to protect against electric shock when using electrical devices near water. It senses when power is going where it should not, and if it senses a problem it shuts off. This is why most codes specify that they be used in bathrooms, kitchens, laundry rooms and outdoor areas. One thing many people do not realize is that these devices are designed to be tested once a month to ensure proper operation. This is done by pressing the test button on the device to make sure it turns off, and then pressing the reset button to make sure it turns on. If either of the test or reset buttons do not work it is time to replace the device.