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Heart rate monitor.Time, Pedometer, Distance monitor Calorie monitor, Alarm clock, Sleep monitor, Camera remote, Calculate heart rate accurately by PPG sensor. Touch key and press key operated. Compatibility Requires Android 4.3 or above, iOS 7.1 or above, Bluetooth 4.0 or above, download APP as mentioned in the manual from Apple Store or Google Play. Waterproof TPU material waterproof, not afraid of washing hands doing housework walking under rain. The New AK-4 Band Comes With A 0.96inch HD Screen and Sleek Light Weight Yet Durable Design Which Makes It Very Comfortable To Wear And Carry Around. Comes With Flexible And Solid Silicon Straps For More Comfort.