A flashing locator switch control includes an audible alert circuit with the switch and flasher to provide assurance to the user that the outside light is operating to flash on and off and by which to test the outside light at any time day or night....http://www.google.es/patents/US5406129?utm_source=gb-gplus-sharePatente US5406129 - Flashing locator switch control with built-in lamp operation test
Flashing locator switch control with built-in lamp operation test
