2pk 30V, 0.5A Tiny 9.6mmx1.8mm Reed Switch by Meder (1102-7266).

Specs:

Glass body reed switch

9.6mm long x 1.8mm dia.

SPST contacts that close when a magnet is brought near.

Warning:

This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov