There is a blue and red LED mounted on both sides of the drive.

By the late 1990s, blue LEDs had become widely available.

A combination of red, green and blue LEDs allow almost any color to be produced.

As he did a blue LED on the other end of the cylindrical device began to blink.

Usually red, green and blue LEDs are used to get a wide colour range.

The blue and red LEDs get closer to their theoretical limits.

It sports a clean, black face with hidden blue LEDs and one button in the center.

Parking spaces for disabled and people with strollers are indicated by a blue LED.

Building upon this foundation, in 1993 high-brightness blue LEDs were demonstrated.

A blue LED will blink slowly behind its eyes to indicate that it is receiving power and attempting to establish a connection.