See the existing thread. This is a really old device and it works as a secondary controller only, which means it’s not going to work the way you think.
You will not be able to use the buttons on it and have the smartthings hub recognize that those buttons were pushed. You can add it to a SmartThings network, but after that the hub will just ignore it and the 45631 will not talk to the hub.
What you can do is use the 45631 to send on/off messages directly to some other Z wave devices which are within one hop of it. So it’s OK as a wall switch if you only have other Z wave devices in that room. But that’s about it.
It will also only be able to talk to devices with zwave ID of 32 (hex 20) or lower.
Please ask any follow-up questions in the following thread: