The Charge 5 improves on earlier Charge models by adding a color screen and an electrocardiogram (ECG or EKG) app on top of the already-strong fitness and sleep tracking Fitbit is known for. There’s a built-in GPS so you can track outdoor workouts without your phone, plus a blood oxygen sensor. With the recent addition of a new Daily Readiness Score, the Charge 5 can also tell you if your body is up to taking on a workout, or if you should take a rest day. But many of Fitbit’s most useful features, like this score, are only available as part of Fitbit’s $10-a-month Premium service. Without a Premium subscription you can still use the Charge 5 for fitness and health tracking, it just won’t give you the most in-depth metrics and trends over time. The battery should last you at least four full days and it’s compatible with iPhone and Android.

Read our Fitbit Charge 5 review.