About this item

• 1.4in l x 0.9in w x 0.5in h, Backlit OLED display, GPS, Optical heart rate monitor - 24/7 heart rate tracking, NFC, 3-axis accelerometer
• Get call and calendar alerts, send text notifications and quick replies. Automatic sleep tracking and silent alarms on your wrist
• Battery life up to 7 days, or up to 5 hours with continuous GPS use. Water-resistant to 50 meters.
• Compatible with Android and iOS devices. Syncing range: Up to 30 feet.
• US Model w/ warranty. In Box: Fitbit Charge 4, Blue and Black Classic Bands (Small and Large), Charging cable.