Depending on your device, there are different ways to bring your device online.
All generations of the Nuki Smart Lock are compatible with the Nuki Bridge. The Nuki Bridge brings your Smart Lock into your Wi-Fi network.
Built-in Wi-Fi module
The Smart Lock Pro has a built-in Wi-Fi module. You don't need any additional accessories to control your Smart Lock remotely.
Remote Access via Thread
The Smart Lock (4th generation) supports Remote Access via Thread. With a suitable Matter hub that supports Thread, you can also control your Smart Lock remotely.