The Directed 8600 Magnetic Micro Switch is ideal for protecting sliding doors and windows. This is one of the most compact magnetic switches available. To make things easy adhesive has been pre-applied so you can stick and go. Ideal for protecting sliding doors and windows. When the 2 magnets are together the contacts are open; contact closes when separated. Compact design is hardly noticeable. Pre-applied adhesive backing for ease of installation. Prewired leads for ease of use.