A 4 pack of Pumps including the Base Station and Base Station Power Supply.
The Base Station also includes buttons to manually interact with the connected pumps for priming, indexing, etc.
The other advantage of the Base Station is it only needs one power socket instead of 4 if you buy single Versa's.
Different Dosing modes and Scene and Routine Control option
Very Large Dosing Range .5UL-300ml/minute