Our club used to use them and still have a full set of house transponders, bridge and software. I can't remember exactly what the power limit is but I have powered them from micro helicopter lipo's 3.7v 1s and I'm sure I read they are good up to 9v but don't quote me, the 2032 type battery was 1 option I looked at but as they are not rechargeable I didn't bother
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