2 Pack Ankle Bands for Step Counter 11 Inch Step Tracker Activity Tracker Fit Watch Fitness Watch Reflective for Runningwith 2 Size Tracker Not Included

At present, our ankle band compatible with the following models:
Fitbit Flex/ 2, 
Fitbit One, 
Fitbit Alta, Fitbit Alta HR
Fitbit Zip, 
Fitbit Charge 2
  (note: fitbit charge 2 will may not track heart rate while wearing in our band)
Other fitness watch (diameter≦4cm or longest side≦4cm)