Batteries???

Can anyone tell me what kind of batteries this takes? It's for the Yong Heng. It's the temperature probe.
Thanks!

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The fact that you can get 20 batteries delivered for $5 is hard to believe…I looked at the link and it shows that I bought the same batteries last year, I have no memory of this, but sure enough I have them.
My daughter in-law mentioned having a new engine in her jeep a couple of months ago so I asked where she got it. She said I purchased all the parts and built it for her 4 years ago. I had no recollection until they kept saying things that jogged my memory. Getting old sucks.