Red and green traffic lights have been around since the 1800s, when British traffic officers used to rotate gas lamps that burned red and green to control the movement of mostly horse-drawn vehicles.

The traffic light is a ubiquitous feature of modern life and is quite old — dating back to 1868 London, although that device was a modified railroad semaphore operated by a policeman, but it was the ...

Amazon's Echo speakers are available in all sorts of shapes, sizes, and designs. One commonality on all Echo speakers, however, is an LED indicator light. Often, the light appears as a yellow ring, ...

These notifications signal that certain tools are ready to be used for the iPhone user, and can be helpful to look out for. The iPhone comes with a number of different applications that can help with ...