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v3ext is the same as v3 but with more memory.
v3 32mb usb1.0 200mhz processor 4 levels gray scale (The original Device)
v3ext 512mb usb1.1 200mhz 4 levels gray scale (The is 2nd generation it is called v3ext to differentiate) uses the same firmware
v3+ 512mb usb2.0 400mhz processor 16 levels of grayscale (Is the latest version apart from the size and shape is completly new device)
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