Cheap Motion Sensors That Tell You Your Windows and Doors Have Opened

With the release of Dropcam's Pro webcam last fall, the company set the scene for some interesting wireless accessories with the inclusion of built-in Bluetooth LE. With an API it hopes to get other companies to make accessories too, and to encourage development the company has just revealed its own official accessory: a cheap motion sensor that lets you know when doors or windows have been opened and closed.