Alfawise door sensor device handler?

[sidjohn1]

This device? Cause Smartthings is not a 433mhz gateway.
https://www.gearbest.com/access-control/pp_009265973897.html

This may help though

Cheapest (reliable) door/window sensor (UK)

Cheap and reliable don’t always go together. Right now there are three popular solutions for those in the U.K. for whom cost is a primary factor: 1. Very inexpensive, somewhat wonky. Xiaomi sensors are very inexpensive, often £7 to £9 from gearbest.com , but most of the models are not certified to the zigbee home automation standard, so they are somewhat “idiosyncratic.” Pairing can be very difficult. After you do get them paired, you may find that they don’t work well with all your repeaters, which can cause messages to get lost and status to fail to update, or they may drop off the network all together. And at least once a platform update from SmartThings caused all of them to fail at once. So for those who are willing to run the risk, these can save a great deal of money, but…