. 10 Functions Heart Rate Monitor: . Automatic FAT burning program according to age input. . Three different audible alarms. . Two visual alarm. . Current heart rate display (35 ~ 250 beats per minute). . Age input re-settable. . Target zone indicator. . Weak battery detection. . High limit display of target zone. . Low limit display of target zone. . Unique transmission LED indicator. . Large LCD reading. . Auto power saving. . 3V Lithium batteries. . Batteries replaceable.