How long do they last on a battery? I have the older version https://www.aliexpress.com/item/32845863956.html which runs on a about 9 months on a rechargeable AAA penlite. But I could use a few more and these new ones are a lot cheaper.
One thing to note with the new model, the Bluetooth messages are encrypted and a device bindkey is needed to read the temperature values. Fortunately there is a great project over at https://atc1441.github.io/TelinkFlasher.html which can pair with the device and retrieve a bindkey from within the web browser. Then you just need to plug the bind key and MAC address into ESPhome and you're good to go.