Crowtail Tilt Switch CT0023TS Elecrow bazaar, Make your making Crowtail Program project easy.

The Crowtail- Tilt Switch is a sensor to detect the station of forwards. It outputs logic LOW in the Horizontal direction and logic HIHG in the vertical direction.
Inside the tilt, switch is a pair of balls that make contact with the pins when in the case of vertical. Tilt the case over and the balls don't touch, thus not making a connection.