Rubber band - Band length: 26cm - Features: calendar / wireless heart rate monitor / 7-day memory / heart rate overload warning / stopwatch / exercise intensity level / Calorie / backlight / alarm clock - Time format: 12hr/24hr - Date format: DD/MM or MM/DD - Year: 2000~2050(auto-calendar) - Alarm: Daily 5 alarms - Count-up timer: From 00:00:00(Min:Sec:100th sec) to 99:59:59(Hr:Min:Sec) - Laps: 35 laps - Calorie calculation: 0~9999kcal - Fat calculation: 0~9999g - Uses 1 x CR2032 battery (included) - Comes with English manual & chest belt (39~150cm length)