Kellermann's High Power LED Technology:. Longlife Protection Guard, IC controlled, 330 kHz clocked. This circuit, together with other measures, ensures that the LEDs achieve their possible lifespan, with maximum brightness and minimum power consumption.. The Atto Marker Lights:. Extremely small and also spectacularly bright. The compact size and design options allow the turn signal to virtually disappear. When flashing, it radiates with an intensity which has made the products designed by Kellermann legendary. Kellermann's EXtranz (Extreme Optical Transparency) and HighPower LED technology with Long Life Protection Guard significantly increases rider visibility on the road.