From: Amazon com- Microsoft Band 2 Medium Cell Phones & Accessories
*Size Medium fits wrists 6.3″-7.5″
*Continuous heart rate monitor tracks your heart rate, calorie burn, and sleep quality
*Works with Windows Phone, Android and iPhone
*Get email, text, calendar, and call alerts on the go
Tracking for running, biking, golf, and more
source: AMAZON.COM
for getting more info. you are willing to welcome at htorez.blogspot.com
Thanks