@Andrew_Bartlett mentioned a Frient relay in another thread and I was curious if anyone in the UK has tried these. Zigbee 3.0 , look nicely engineered, decent prices in the middle range.
In addition to the usual models, they also have a heat alarm (something often requested for garages since smoke sensors often get false alarms from car exhaust)
They also offer two models of door sensors, one with a temperature sensor and a less expensive one without. And what looks like a nice humidity sensor.
These all promise multi year battery life with standard AA batteries. They are larger than the aqara sensors, but may be better at staying connected to the network.
Most models have a “works with smartthings“ logo.
Anyway, I just wondered if anyone has tried them. They don’t seem to be available in the US at present.