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 HR also uses a more traditional clasp instead of the Charge's snap-in band, and it gets five days of battery life instead of seven days. Sitting at the top of Fitbit's line up is the $250 Surge, which despite its smartwatch-like appearance is more serious about fitness tracking than any of Fitbit's cheaper models.