The LS-GAPSENSOR is a photoelectric sensor designed to sense the "gap" between labels and provide a trigger signal used to flash a stroboscope. Since the LS-GAPSENSOR is an automatic one-touch sensor…not the conventional "teach mode" sensor…set-up is simple. Position the gap between the labels directly under the sensor's sight guide and push the appropriate Autoset™ button. The sensor does the rest, adjusting itself to the perfect setting. Sensing labels has never been easier.