It’s called Elasty and it was created by designer Yoori Koo. It’s a silicone bumper fitted with elastic strips which allow you to stash your headphones, pens, cards etc. on the back of the phone. smart!
You place the Lockitron over your existing deadbolt, and it connects to your phone. So you can use your phone to lock or unlock the door from anywhere. Best of all, it fits on the inside of the door, so you don’t need to worry about somebody messing with it. Plus this device has Bluetooth; you can simply walk up to the door, and it automatically unlocks.