undefinedThe water-resistant Fitbit Charge 4 has been created with a battery that will provide up to 7 days usage, a POLED screen, built-in GPS, sleep tracking and heart rate monitoring. This stylish device provides convenience on the go and can help to inspire you to hit your health and fitness goals. Active Zone Minutes
Fitbit has created a new metric: Active Zone Minutes (AZM) to help you work out smarter, as a minute of walking and a minute of running don’t provide the same benefits. By using your personalised HR zones to alert and reward you for higher intensity movement, Fitbit makes it easy for you to hit your health targets. Smart Wake
Enable Fitbit Charge 4’s Smart Wake feature and this handy device will find the best time to wake you up (based on your optimal sleep stage), starting 30 minutes before the alarm time that you set. Don’t worry, if this feature isn’t activated – your alarm will go off as per the set time. Sleep Stages
Fitbit Charge 4 can track your light, deep and REM sleep and then provide insights about your slumber.