Now all you need is your smartphone to enter your home using the Kwikset Kevo Smart Lock with Bluetooth enabled deadbolt for iPhone 4S, 5, 5C & 5S, 6 and 6 Plus. Installation is easy and its practicality more than pays for itself. No more juggling through keychains, bottle openers and whatever else may be in your keychain. The Kevo lock has a unique and patent pending feature to detect if the authorized user is inside or outside of the house, so there will be no accidental unlocking from an unauthorized user outside. Send eKeys to guests or schedule a time when certain eKeys are accepted. The level of customization and security is extensive with the Kwikset Kevo Smart Lock.