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In diffused lens LEDs, this circuit is visible as a small black dot. Most flashing LEDs emit light of one color, but more sophisticated devices can flash between multiple colors and even fade through a color sequence using RGB color mixing. Flashing SMD LEDs in the 0805 and other size formats have been available since early 2019. Flickering
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.
If a blue flashing light is seen in either traffic or the sea, other vehicles must yield to let that vehicle pass. Blue flashing lights are used by police, military police, customs, fire departments, rescue services, and ambulances. Government, VIP, and embassy vehicles may also use blue if accompanied by local police.