• 【Package Includes】: 1Sets x MC-33C Magnetic Reed Switch.
• 【Function】: The door contact sensors work as an anti-theft alarm, ideal for metal door and window.
• 【Easy To Install】: Have small screw terminals which makes it much easier to wire. Closed loop magnetic contact that features a terminal block style connection for accepting wire.
• 【Switch Type】: NC means normally closed: When the magnet together, the circuit is conductive( light on ); when the magnet separate, the circuit is not conductive ( light off ).
• 【Risk-Free Guarantee】: You will get a full unconditional money back guarantee if you are not happy with this product .If you have any questions, please feel free to contact us to get the most satisfactory results.