Unlike in the product description here at the Amazon Lichtschrake is also suitable for robotic vacuum höherern a series. I have the 620s and make it work perfectly. It seems to me however that the infrared beam is laterally fanned a little, because the robot stops already a few centimeters in front of the imaginary dividing line. Long-term experience, especially with the battery life I have not yet, however, the light barriers have so that they can save a on / off switch, when not in use electricity.
