For you guys worried about leaving your door open...
I just installed this setup on our door.
Liftmaster Connected Home
$100 worth of parts, cheaper if you search online. Installed on our 10yr old opener no problem. i can open, close, and check the door from my phone. Really nice when I go for a bike ride, don't have to take keys, just get back and punch it open from my phone as I'm riding down the block.