This is a very small light sensor. A photo resistor (also known as a photodector, or photocell) changes resistance depending on the amount of light it is exposed to.
Open Box - The MGS1600GY is a sensor capable of detecting and reporting the position of a magnetic field (typically magnetic tape on the floor) along its horizontal axis. with custom aluminum mounting bracket
The DXe is the affordable way to equip your sport plane or trainer with the speed, and reliability of DSMX control. Of course it works great for robots too!