***UPDATE*** Another entire week of nonstop wear has passed (today around 5PM) and I am pleased to say the battery is only down to 48% this second week of nonstop usage! It is currently about 9AM so in 8 hours it will not drop much for an entire week of use, very impressive! This is the Android app I am using as there look to be 3 versions: https://play.google.com/store/apps/details?id=com.veryfit.multi&hl=en URL(s): http://www.amazon.com/dp/B06XTB86XW Item(s): Fitness Activity Tracker, 11TT YG3 Sports Bracelet Wristband Pedometer Smart Band with Step Tracker/Calorie Counter/Sleep Monitor/Call Notification Push for iPhone iOS and Android Phone Color: Black Review sample provided.