Miniature convergent diffuse photoelectric 3.5mm thick Sensing range between 2 and 25mm ('converging' at 10mm) Consistently senses objects that may vary dramatically in colour or surface property 'Light-on' or 'Dark-on' versions Visible red emitting element for easy alignment With stability and operation indicators Environmental protection – IP67 H 19 x W 10 x D 3.5mm