I have been using this since 3 months and I am reviewing this after 3 month of using this is best fitness band than others it includes everything ( which have to in this ) except heartrate monitoring , if you can sacrifice with this you should go through for it , it detects almost accurate step count as well as calories burnt its connected via bluetooth and works by its own app which have download by you in your phone the best I love in this , it shows caller id ( Name and Number ) when you have incoming call in your pocket and too its vibrate when any notification or call held OVERALL WORTH TO PURCHASE