Garmin vivofit 4 is a slim, swim-friendly activity tracker with a customisable colour display and 1+ year battery life. Track your steps, sleep and more, plus get a personalised daily step goal based on your habits. With the Move IQ feature, vivofit 4 automatically captures a variety of activities, such as walking, running, biking and more, to view on Garmin Connect. This slim, swim friendly activity tracker has a customisable colour display and a 1+ year battery life — no charging necessary. It tracks your steps, distance and calories burned, monitors sleep and provides a personalised daily step goal. With the Move IQ feature, vivofit 4 automatically captures a variety of activities, such as walking, running, biking and more, to view on garmin connect. Vivofit 4 includes tools to set alarms and timers, check the weather and find your phone. Safe for swimming and showering with 1+ year battery life. Use the Toe-to-Toe feature to challenge your kids to a step competition. Your vivofit 4 activity tracker can wirelessly connect to your child's nearby vivofit jr. 2 or even another vivofit 4 to kick off an instant timed step competition. Connectivity Proprietary operating system. Bluetooth 4 connection. USB 2 connection. Display information 11mm Memory-in-pixel (MIP) screen. Battery 115mAh battery capacity. Typical usage time of up to 365 days. Low usage time of up to 365 days. Replaceable battery. Physical specification Size: large. Watch size H60, W19, D9.4mm. Strap size L223, W19, T2mm. Weight 25.5g. Features Water resistant. Swimproof. Dust resistant. Scratch resistant. Pedometer. Distance. Accelerometer. Calories. Sleep. Manufacturer's 2 year guarantee.