You'll also receive tips for a better night's sleep. You can see how long you were in each sleep phase and what your sleep score is. In the morning, you'll receive a report in the app. You'll also no longer receive notifications. The sleep mode of the watch dims the display and stops responding to movements. The Charge 4 doesn't work in combination with Huawei smartphones. Do you have an iPhone? You need an iPhone 5s or newer with iOS version 11 or higher. In order to use the Charge 4, you need an Android smartphone with Android version 7 or higher. You can also receive notifications from your smartphone, measure your sleep, and make contactless payments via Fitbit Pay. That means you'll no longer need to bring your smartphone. During a run, the Charge 4 registers your distance, speed, and route thanks to the integrated GPS receiver.

The Fitbit community motivates you, as you can earn badges, share statistics with friends, and compete in challenges. You'll be able to see at a glance whether you've already followed the World Health Organization's advice to exercise 150 minutes in moderate intensity or 75 minutes in high intensity every week.

The tracker measures the intensity of your workout based on your heart rate zone. Don't just move more, move smarter with the Fitbit Charge 4 Black.