With Lockitron you can lock your door from anywhere in the world or see if your door is locked when you’re gone. Any smartphone can use Lockitron through its intuitive two-button app. Lockitron is equally helpful if you’re away from home, where you can use its new iPhone app to manually and remotely unlock the door for friends using a smartphone app. And you can give them their own access by entering their email address and phone number. And more than that Lockitron lets you know if someone has knocked on your door, and it can sense if your door has been unlocked, notifying you immediately.