Coolang Tennis Tracker
Tech specs 
DimensionsDiameter 30mm
Thickness 10mm
Weight6 grams
Battery life5 hours
Water resistanceSplashproof
Internal memoryYes
DisplayNo
SensorsGyroscope and Accelerometer
Smart watch compatibleNo
RemovableYes
Compatible brandsAll
Metrics 
PowerYes
SpinYes
Impact locationNo
Number of shotsYes
Shot typeYes
Spin typeYes
Swing speedYes
Ball speedYes
Live trackingYes
Video functionYes
Other
Links 
View onAmazon
Amazon US rating
Read moreArticle