A: An inferior vena cava filter is a cone-shaped metal device that prevents blood clots from traveling to the lungs, according to Cleveland Clinic. Doctors place this device in the inferior vena cava to catch blood clots that have broken loose, explains the University of Michigan Health System.
Fitbit Blaze requires a maximum of 1 â 2 hours to charge fully. It comes with a rechargeable lithium-polymer battery. Since itâs a smartwatch comes with the fitness tracker. The Fitbit Blaze has the improved battery life and it can go up to 4-5 days per charge.
The Fitbit Charge HR is Fitbit's latest big fitness move: it adds heart-rate tracking, something tons of bands and trackers have started adopting. It tracks heart rate 24 hours a day, even when you sleep. It syncs everything to your phone. It still looks like the older Fitbit bands, but it does more.arah Tew/CNET. For $20 more than the non-heart-rate-tracking Fitbit Charge, this seems like a no-brainer ($150 versus $130 for the Charge in the US; in the UK, it's Â£120 versus Â£100, or $180 versus $150 in Australia).