Socket for an optional plug-in secondary sensor on a cable (Remote Sensor).
It's very cool hardware and I'm tempted to order, but my understanding is it only has one onboard temperature sensor that reads the internal temperature, and for anything else you need this optional secondary sensor cable?
Is there any reason why this is brought to market before this cable is available? I've lost count how many Amiga products that have been advertised in the past to have upcoming features that have failed to materialize, like the expansion module for Kickflash OS4, Mediator Mpeg 2 decoding card from Elbox, the 3D and PPC expansion modules the the PicassoIV, I might be wrong but wasn't there a planned expansion module for the Prisma Megamix card as well?