Factory refurbished: Add-on Smart Radiator Thermostat - Quattro

There doesn’t appear to be anything wrong with the SRTs themselves but the ongoing connection problems have resulted in very short battery life for them.
However, I think I may have solved that wee problem.

I have put these on all my radiators. Now my boiler comes on only when a radiator thermostat tells it to. I am expecting to see a significant reduction in my gas consumption.

Same stuff, but half price at present. Why not

If you are looking for an affordable, energy-efficient way to control the heating in your home and you're comfortable with the potential minor risks of a refurbished product, the Quattro Smart Radiator Thermostat could be a solid choice. It offers smart features like app control, energy monitoring, and adaptive scheduling, making it a worthwhile option for anyone seeking to improve their home’s heating system.

I found the setting up on my phone I found that it was difficult for me to setup the valves, however the company that service my heating did the setup very easy.
I think it is my age and not being that understanding the jargon.