Karrimor active pulse by nuband tracker 1 smarter activity heart rate and sleep tracker 2 clock states the time date and battery level with oled display 3 heart rate monitor it can monitor your heart rate to help you do exercise scientifically the smart bracelet has the real time monitoring by built in dynamic heart rate sensor can record the entire movement of heart rate beats per minute bpm for user to view own motion data and syncs to smartphone app and find the da