After some testing I can make the following observations: * Good: This TRV works fine with recent versions of zigbee2mqtt - so if you have that, you don't need the Gateway * Bad: local programming controls are good looking, but in fact are cumbersome and inconvenient. Look for Saswell SEA801-Z01 TRW - its interface is much more convenient! * Bad: Top cover (which hides the batteries) is poorly fixed and is very easy to open. Thant's not an option for a house with kids.
Very good product, priced well. They include adaptors in box. All of them work fine, pairing is easy. I managed to incorporate it in homebridge with some add-ons. I had one problem but customer care helped me really fast. Also, password is 123456.... I didn't see it anywhere in the manual. All in all - good product.