Another DamnSillyBigFootIdea
The number of controls held by an SI Stick depends totally on what version your stick happens to be.
The capacity is detailed in thefollowing specification sheets
look at for most recent models (11 and above)
http://www.sportident.com/index.php?option=com_content&view=article&id=349&Itemid=2564&lang=en
and for earlier models (5-10)
http://www.sportident.com/images/PDF/1_si_base_products/1_control%20cards/SPORTident-Cards-overview_en.pdf