S2 is a wearable ball games and rope skipping calorie estimating meter. By knowing the movements of the postures in sporting, S2 can estimate the amount of calorie. 

• Estimates the amount of calorie by knowing the movements of the postures in the following sports: badminton, tennis, basketball, table tennis, rope skipping. 
• Measuring user's calorie, calorie burn rate, and the max acceleration in individual ball game.
• With addition pedometer mode, it is more comprehensive than general pedometers.
• The memory function supports the review of daily and hourly total calorie in a day. 
• Work continuously for more than 15 days after fully charged.
• Lightweight and wearable to placed on the waist  with clip.