Fitbit Charge 4 Black Advanced Fitness Tracker

1.4in l x 0.9in w x 0.5in h, Backlit OLED show, GPS, Optical heart rate monitor – 24/7 heart rate tracking, NFC, 3-axis accelerometer
Get call and calendar alerts, send text notifications and fast replies. Automatic sleep tracking and silent alarms in your wrist
Battery life As much as 7 days, or As much as 5 hours with continuous GPS use. Water resistant to 50 meters.
Syncs with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later. Syncing vary: As much as 30 feet.
Global Model – No guaranty in the United States. In Box: Fitbit Charge 4, Classic wristbands (both small & huge), Charging cable.