HandKey allows you to unlock your computer with secure passwords from your watch, control your lighting from within your home, and even inform you via SMS when other HandKey users come and leave your house. With IFTTT and SmartThings integration, the number of ways you can connect and employ HandKey is nearly infinite. In addition to practicality, HandKey also offers a number of security improvements: locking your door (even if you forget) and logging you out of your computer when you walk away. It's a wireless keychain that you can't forget. It's with you all the time.