Kellerman, Atto LED turn Signals
Atto (symbol a) is a unit prefix in the metric system denoting a factor of 10 18 or 0.000000000000000001.
OK, these turn signals are not that small, but with its 13mm diameter the Atto is so small that the lighting surface fits on a 1 Eurocent coin four times.
It uses Extreme Optical Transparency technology, providing spectacularly bright lighting.
Also available as a white position light that also can be used as front parking light, as well as a tail/brake combination light.
All Atto lights feature a minimalistic M5x6.5 mounting stud and are sold each.