	Mini Snap Switch 13.5mm Lever: 3-Pin, SPDT, 2A SG$1.80
This miniature single-pole, double-throw (SPDT) switch can be used as a general-purpose micro switch or as a small tactile bump sensor for your robot. The switch body dimension is 12.8 x 6.0 x 6.5 mm, and the lever arm is 13.5 mm long. [Product Details...]

	Reed Switch - Insulated SG$2.90
This is a small device called a reed switch. When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. [Product Details...]