When Everykey is close to your phone, laptop, tablet, house door, car door, or another access-controlled device, it unlocks that device. When you walk away, that device locks back down. Everykey can also log you into your website accounts. If you lose your Everykey, you can remotely freeze it, so no one else can use it.

This is a cool idea, but an extra "key" is not necessary. Your iPhone can do most if not all of the things this key can do. @nearlockapp will automatically unlock your Mac, An August Lock will automatically unlock your house, and a Viper Smart Start system will automatically unlock your car.

huh, expensive!

Love this idea! :)