This M4 Smart Watch is compatible with devices having Bluetooth version 4.0 and below in smart phones, tablets, and PCs. It keeps track of your calories burnt, sleep cycle, blood pressure and heart rate. The offered watch has features like calling the function which enables you to make a phone and disconnect it, while you can also send and receive messages through it. Before final dispatch, it is checked on different quality parameters by our experts to ensure its premium quality. M4 Smart Watch is provided in safe packaging to avoid damage during transit.