Meet the Master Lock 5440D lock: a Bluetooth enabled lock box that lets you control and access properties from your smartphone. You will be able to monitor guest activity remotely and share access from anywhere in the world. You get notifications when inaccurate pins have been entered multiple times.
This Bluetooth Lock Box is available in portable and wall mount versions. The companion app lets you easily handle guest addition/deletion, unlock/open/relock activity, and registration.