Purchased from ebay for 1250 rs its a geniune product.took 3 hours to charge for the first time.the heart rate monitor does a descent job of detecting your heart beats.battery lasts between 20 to 25 days depending on how much time we keep checking the heart rate and using the mi fit app.the heart beat monitor does not constantly monitor your heart beats, in order to check your heart beat you need your phone and only after giving command on the app you receive can check your heart rate so you need your mobile phone around during running or gymming to track heart rate.the sleep tracking on this app is excellent and it only tracks night sleep but is pretty accurate.its water resistant.the new band provided with this tracker is shorter then the previous generation band but will fit your wrist with ease.you can set phone, message and notification on this band and when you receive a call or message or notification on your phone even if you are away from the phone but within the bluetooth range your band will vibrate to notify you regarding the same which is usefull.the app is basic and functional and can be synced with google fit app.overall to experience how fitness band works and to track your fitness data systematically this band is a value for money its a must have cause we have a busy lifestyle and its good to track your fitness level so its a total value for money and definitely wort buying