F1 Plus WearFit Activity wristband with color display-greyThe product is shipped based on the color or size of the main image of the product page.An activity bracelet opens the door to a host of new features that support you in your active life. F1 Plus is connected via Bluetooth to Android or iOS and is designed to be like your own personal trainer that shows you your calories burned, heart rhythm and blood pressure while you exercise which is important so as not to overexert yourself. If you wear F1 Plus while you sleep, you'll also get your sleep rhythm analyzed to make sure you get the most out of the hours when you spend your head on your pillow.F1 Plus also gives you other benefits like being able to set your own alarms and an automatic alarm that reminds you not to be sedentary for too long. The activity bracelet vibrates and also shows who is making incoming calls and messages.- Makes training smoother- Connects to Android or iOS- Measures blood pressure, heart rhythm and calories burned- Counts steps and how far you traveled on foot- Analyzes sleep rhythm- Set your own alarms- Reminds not to be sedentary for too long- Displays incoming calls and messages- Waterproof to splashes and rainWaterproofness: IP67Width: 2.3 cmLength: 25 cm