[main functions]
(1) Step recording function: 0-999999 (step)
(2) Distance recording function: 0-999.99 km (km)
Or 0-999.99 mile
(3) Heat recording function: 0-9999.99 miles (kcal)
(4) Step time function: 0-99999 (min)
(5) Clock display function: hour, minute and second display,
    12 / 24 system can be switched
(6) Effective step counting function: less than 10 consecutive
    steps are invalid
(7) Interval recording function: it is convenient to record
     some information such as "home to company Steps of interval
(8) Low power detection function
(9) 15 days of super long memory: can record the records of the last 15 days