Did you leave a window open? Did someone just open the door? Detect things moving even when you're not at home. Add a magnetic switch to your Twine, and you can get a text message or email when a door is open or when the mail has been delivered. Have peace of mind when you're away from home.
What else can you do with a magnetic switch? Check out our how-tos for more inspiration.
Includes a 10' cable to connect the sensor to your Twine.