A tilt switch is provided. The tilt switch comprises a housing, a cap, a conductive ball, and a plurality of contact terminals. A chamber is formed in the housing and is defined by a bottom surface and a surrounding surface. The cap is attached above the chamber. The plurality of contact terminals extends from the cap to the bottom surface and protruding out of the chamber. The electrically conductive ball is placed in a space defined by the cap, the bottom surface, and the plurality of contact terminals and is capable of simultaneously contacting with at most two of the plurality of contact terminals.