Through Authenticate 
. 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.
2. Large LCD reading.
3. Auto power saving.
4. 3V lithium batteries.
5. Batteries replaceable.
