While it might be easy to leave the key to the house under the mat, it’s certainly not a safe practice. Master Lock has introduced a high-tech new lock box designed to make finding the spare key easier, while keeping it more secure.

Master Lock’s new Bluetooth miniature safe is sure to keep the spare key from strangers, since it can only be opened with the correct passcode or a registered smartphone. The high-tech key safe attaches to an exterior wall for easy access.

The companion Master Lock app is what makes the creation truly unique, offering a whole series of security options. Owners can lock down the box completely, restrict access times, or offer any friend quick access from a smartphone.

The special app uses Bluetooth to authenticate access for selected visitors, and the same app notifies owners if someone enters incorrect codes or attempts to tamper with the device. Interested buyers can buy Master Lock’s Bluetooth key lock for about $140.