24/7 Wearable The vívofit 4 activity tracker follows your progress 24/7 and lets you ditch the charging cord, thanks to its 1+ year battery life. It’s also safe for the pool or the shower, and its always-on color display is bright and easy to see, even in the sunlight. Let your personality shine through by customizing the screen with color themes, watch faces and text phrases or by swapping out the band for a different one. Accessory bands are available in various colors and styles.