Tuya WiFi (NOT Zigbee) thermostatic radiator valve. Brand new and in original packaging (unopened, other than the box). These are really simple to use. You can use them manually by turning the dial on the top, remotely through the Tuya Smart Life app, or by voice using Amazon Alexa or Google Assistant. For the more adventurous, they can easily be integrated into HomeAssistant for full automation capabilities. Requires 3 AA batteries. Includes a full set of connectors for virtually any radiator.
eBay