Garmin Vivofit 4
The biggest draw for the Vivofit 4 activity tracker may be its battery life: Garmin says the tracker can go for an entire year on its battery (the device uses a replaceable watch battery that users can swap out once it's drained). But even with that long battery life, the Vivofit 4 still is able to offer a color display. It's also rated as shower- and swim-safe, and can automatically detect and capture activities such as walking, running, biking, swimming and using an elliptical. The Garmin Vivofit 4 is priced at $79.99.