Keycard 是一款Mac上很好玩的软件，能够让你用iPhone控制Mac锁屏，利用蓝牙连接，当你携带iPhone远离电脑（即距离超过蓝牙的最大通讯距离），Mac就会自动锁屏，如果别人想使用Mac的话必须输入四位密码才能进入，很不错的一款保护个人电脑信息安全的自动锁屏软件！
[Keycard 在 Mac App Store上售价45元]
软件介绍
Keycard is undoubtedly the easiest way to keep your Mac secure when you're not around.
Using Bluetooth®, Keycard locks your Mac using your iOS device when it detects you are leaving your computer. When you come back, it unlocks it for you. Leaving your desk for 10 minutes? Grabbing a coffee in the library? Take your iPhone or other iOS device with you and it can serve as your own personal “Keycard.”
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