Lockitron device(设备)

　　After you fix the Lockitron device($179) on your door and download the app,you can unlock the door by texting your password(密码) or tapping the app on your phone.The device is placed on the inside of your door,and the app works with any smartphone.

　　August Smart Lock

　　Security gets very social with the August Smart Lock($199),which uses an app to sense and give access to those with approved smartphones.Approach the entry while logged(登录) in to your account,and the door will automatically unlock.You can temporarily add a friend who wants to borrow a measuring cup or set up a schedule to admit the cleaner each weekday morning.

　　Goji system

　　For the Einstein of digital unlocking devices,go for the Goji system($245).It replaces your lock and features an LED display that flashes a personalized greeting as you approach the front door.It also has a built-in camera,which takes a photo of visitors(expected or not) and sends it straight to your smart-phone.Watch out for thieves.

　　Kwikset Kevo lock

　　The Kwikset Kevo lock($219) offers the ease and convenience of digital access with a traditional “key” feel.A little device called the Fob—roughly the size of a stick of gum—easily fits on your key chain and operates with the lock:All you have to do is tap the two of them together to unlock the door.

　　5.What is special about the August Smart Lock?

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