The super-sleek 8.8mm watch body is made from lightweight yet durable aircraft-grade aluminum alloy and weighs only 24.4g, while the ocean-like curved glass screen assimilates into the bezel-less design, for total immersion into your display. See what you want, when you want it, thanks to the 1.75-inch display area, which has increased by 14% compared with the previous generation, and boasts a 72.4% screen-to-body ratio that's among the highest in the smartwatch industry. Extra light and slim 8.8mm Aluminum Body, Ultra HD AMOLED Display, and classic navigation crown. Monitor your heart rate all day even while swimming and receive alerts for abnormally high or low heart rates. It can be use by adult and teen.