Garmin V&iacute;vofit 2 Activity Tracker, Black (Certified Refurbished) w/o ant stick Certified Refurbished product is tested & certified by Garmin to look and work like-new. The product includes all original accessories, and is backed by a 90 Day warranty. 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 - vivofit 2 stays on for more than a year without having to change the battery, so you dont have to worry about recharging. AUTO SYNC - vivofit 2 automatically syncs with paired mobile devices at strategic times throughout the day, such as when a goal is met or when several steps have been taken since the last sync.