

I got these: https://www.pearl.de/a-ZX7311-3110.shtml;jsessionid=nAF84CDBD95715305C44924424332C488?vid=953&curr=DEM
Not sure how precise they really are but they connected easily. Have them running for 34 months now, they run for months on rechargable AAA (I got high quality ones, Varta I think)
Seems like they have the same chip. I didn’t buy for the price in the store, it seems to change frequently