Garmin v&iacute;vofit 2 Activity Tracker, Navy Move bar w/audible alert- Reminds you to stay active throughout the day by displaying a red move bar and sounding an alert after one hour of inactivity. Additional segments lightup for every 15 minutes of inactivity. Walk for a couple of minutes to reset. BACKLIT DISPLAY - The display is always on so you wont miss a beat. Turn on the backlight to see your stats, even in the dark. ACTIVITY TIMER - Record activities with or without a heart rate monitor. 1 + year battery life - vvofit 2 stays on for more than a year without having to change the battery, so you dont have to worry about recharging. Auto Sync - vvofit 2 automatically syncs with paired mobile devices3 at strategic times throughout the day, such as when a goal is met or when several steps have been taken since the last sync. Unit Dimensions: 21 mm wide x 10.5 mm thick (length varies based on band size; 120-175mm (small wrist circumference) and 152-210mm (large wrist circumference)