Lenova HW01 is a good watch with features like battery, heart rate sensor, step counting, sleep monitoring, alarm, call and other notifications connected to mobile.Design and touch response is very good.Trackers are very good.if you track your heartrate then it will give accurate result.when comparing with other bands, this smart band provide accurate data.but if you are a swimmer then don’t buy this watch because there is a micro usb port for charging.so, water enter into watch from usb port.battery is also good and gives 7 days charge.It has a function to record real time heart beat during exercise.it shows calories burnt.it has anti-sleep function which awakes user in case of sleep by vibration.This product is user friendly.it is easy to varry and has very less weight.it is easy to operate.To use this band, install lenova smart bracelet app from playstore.This is great product and worth of buying it.