Knock is a
new app that lets you unlock your Mac by knocking on your iPhone! No
more need to keep typing your password every time you get back to your
desk, simply knock twice on your iPhone(even works in your pocket), and
your Mac unlocks. All you need to do is pair your iPhone via Bluetooth
to your Mac, after you finish setup you´re done. If you´re phone gets
lost or stolen, simply sign-in with your old-fashioned password, and
disable your iPhone with one click. This might be a gimmicky product for
some, but we find it very useful and quite cool. watch the video