Garmin v&iacute;vofit 2 Bundle with Heart Rate Monitor, Black 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. Sensor Compatibility - Pairs with heart rate monitor chest strap (included in bundle package). 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.