It looks like a regular bottle cap. Why do I need it?

[:en]The iCap uses sophisticated technology that looks and feels like the common sorters and pill vials we use everyday. With no buttons to press, there’s no learning curve to overcome or need to change in your routine. The replaceable coin-cell battery in the iCap (first one provided) make these revolutionary medication adherence tools last up to a year in between battery changes.[:es]The iCap uses sophisticated technology and yet to look and feel like the common sorters and pill vials we use everyday.  With no buttons to press, there’s no learning curve to overcome or need to change in your routine. The replaceable coin-cell battery in the iCap (first one provided) make these revolutionary medication adherence tool last up to a year in between battery changes[:]