Texas Instruments’ TI eZ430-Chronos watch syncs with receiver box mounted on deadbolt. A sequence is tapped on the face of the watch, activating a servo inside the box that opens the door. The watch features integrated pressure and temperature sensors, a 3-axis accelerometer and 128-bit AES encrypted wireless. If you want to try something like this yourself, the watch should be restocked on the Texas Instruments website soon, it should be on sale soon.”]
Source: https://gizmodo.com/highly-hackable-ti-watch-used-to-wirelessly-unlock-door-5453913