Smart Watch, Mixca&reg; Waterproof M3S Smart Bracelet Heart Rate Monitor Bluetooth Smart Watch (Gray ) Watch Band Length:155mm-210mm Step count, distance, calorie consumption management, sleep management, time display, event reminders (water, medication, meetings, etc. Custom), call alerts,message alerts, clock display, sedentary reminder, vibration alarm, remote self-timer bell . Automatically sync data via Bluetooth 4.0 with Android 4.4 above smart phones (such as Galay S4,Galay Note3 etc.)and other IOS7.1 or above iphone Supported models: For iPhone 4S / 5 / 5C / 5S / 6 / 6P IOS7.1 above, Android 4.4 and above Display: 0.49 inch OLED