M4 Fitness Smart band: If you're a fitness freak and love keeping a track of the calories burnt, sleep cycle, and heart rate, and then the M4 Smart Band is what you need. This smart band works as a heart rate tracker, fitness watch, and an activity tracker.M4 waterproof Smart fitness Band compatible with Bluetooth or Heart Rate Sensor. It is compatible to devices having Bluetooth version 4.0 and below in Smartphone, Tablets and PC's and also support Android. Functions: \n1.Heart Rate Monitor\n2.Sedentary reminder\n3.Calories\n4.Time\n5.Alarm\n6.Anti-lost\n7.Distance calculation\n8.Step Monitor\n10.Call Alert\n11.Wrist sense\n\nPre-requisites for use: Your mobile phone Bluetooth version must be Bluetooth 4.0 or higher Android version must be Android 4.3 or above. \n\nWorking: To connect the smart band to mobile phone, you need to connect the current mobile successfully via Bluetooth.
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