5V 30mW レーザ光電スイッチ

This product is a Class IIIB laser, but does not have any labeling or warnings to tell you that. Even a split second of direct contact with your eye can cause permanent damage, as well as direct reflections off shiny surfaces. Apart from that, the sensor works well. Although the power supply is 5V, the output is actually 3V PNP which means it cannot be used directly as an Arduino input, so I am using it to activate a relay instead.