Korner is a cheap and super simple alarm home security system. It consists of small motion-detecting tags that attach to the corner of your door or windows, and a wireless dongle that you plug into the ethernet port on your router. If one of the tags detects movement that it associates with the window being opened, it’ll send a signal to the dongle, which will then notify you on your smartphone. Using that app, the user can then contact the police, or forward the alert to someone else who can look in on their place. The app also lets them turn the system on and off manually, or set it to a program. They're currently raising production funds for Korner, on Indiegogo, $89 pledge will get you a set with three of these, and one fob.
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