Please, also check the more detailed instalation instructions.
Umwelt locks your computer when you are away from it and unlocks when you come back, automatically. By measuring the strength of the Bluetooth signal from your smartwatch, it "senses" when you are close or away.
Designed with the needs and restrictions of wearable devices in mind:
See more details in the tutorial: How to install and use Umwelt on Windows and Wear OS.