There seems to be four patents involved, and they, on face value, look pretty broad and vague, e.g., ‘providing performance data to an athlete‘! Another has to do with exercise functionality being monitored by a networked APP. Philips is claiming that Fitbit’s violations go back to 2007 (which is a long time) while Garmin only started to infringe 7-years later.
Philips is basically asking for damages and for Garmin & Fitbit to may a licensing fee going forward. This will drag through courts for years and each company will spend millions in lawyers’ fees arguing their case.