Fitbit’s new Charge 5

Fitbit is officially announcing the Charge 5, the company’s latest fitness tracker, and it marks one of the biggest design changes to the popular Charge family since the first Charge HR, which came out in 2015. The Charge 5 shaves down the hard angles that have defined the Charge trackers for a more rounded look, and more significantly, it’s the first Charge with a color AMOLED display.

The Charge 5’s screen is 10 percent larger than the Charge 4’s, and can get up to 450 nits bright, up from the Charge 4’s 200 nits. That all means that the screen should be easier to see when you’re outside. And you can also opt to have the display on at all times — which means you won’t have to wait for the screen to light up just to see the time.

while the always-on display could also be quite useful, it comes at a significant cost of battery. While Fitbit advertises up-to-seven-day battery life with the Charge 5, that’s with the always-on display turned off. Turning it on cuts that down to just two — much closer to what you might be used to with a more traditional smartwatch than the Charge 5 resembles.

The silver rails on the side of the Charge 5 might look like buttons, but they’re actually sensors that let you take electrocardiogram (ECG) readings to check for signs of atrial fibrillation (which is only available in some countries) and electrodermal activity (EDA) readings to check your body’s response to stress. Both features are also found on the company’s Sense smartwatch line.

Charge 5 has a host of other health tracking features, like monitoring your heartbeat, your sleep, and your oxygen saturation (SpO2) levels. Fitbit is also announcing a new “Daily Readiness Score” alongside the Charge 5, which seems similar to what’s offered by the Whoop wristband. The Daily Readiness Score suggests different levels of exercise based on your recent activity, sleep, and heart rate variability to make sure that you’re recovering effectively. If your score is higher, Fitbit will recommend more intense activities, but if it’s lower, Fitbit will recommend a lighter workout.