VPSA132 wrote: I own something similar:

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I think I need to throw it in here.
It's worked great for two years now. Works on AAA rechargeable batteries and on batteries.
That week I replaced the rechargeable batteries for the first time after two years.
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I bought one now, I was depending on AAA power.
And unfortunately I find that it has a tragic range! Where any knefel still has an LQI above 30 it no longer works completely. In practice, this thermometer only correctly sends data to me being a floor below the antenna, in the rest of the house not.
Strangely enough there is a ZTU module inside so it should have a good range.