Most of modern-day garage door openers are controlled by a different unit that sits between the garage door opener and also the real opener itself. This system is typically an LED sign that flashes an LED (lighted indicator) whenever it identifies that the door is open. A lot of these units have a miniature LCD display that shows details such as the current time, if the door is presently open, as well as the period of the ""blink"" which describes the quantity of time the LED has actually been on. A few of these newer versions use extra attributes such as an ability to see through partially clear doors. Garage door openers are normally extremely small gadgets that are kept in ordinary sight, for convenience of use and to conceal any kind of electrical wiring or junction boxes.