I have the first and second, this is my third case, they are perfect for portable pi projects, the pro has room for a pi 4b with a hat on it and a place for another hat connected by cable, the fan feels comfortable, rubber bearings reduce noise and vibration, i have pi 3b+ in smarti pi 1, raspberry pi 4 b 4g in smarti pi pro, there is pi 4b 4g in smarti pi pro with 4g/3g mobile network and an AIS receiver for chartplotter acts as a backup of my chartplotter on my boat
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