Excelvan SW1-B Healthy Bracelet Step Counter Silicone Wristband, Smart Hand Ring Bluetooth Sleeping Fitness Running This smart bracelet with OLED screen clearly displays health parameters including steps, calories, distance, time and sleep quality. With silicone adjustable wristband and light weight feature, you can wear it comfortably, such as running, climbing. When you do exercise, it can record your sports data. When you sleep, it can monitor your sleep. All these data can be synchronized and analyzed on your smart phone. Wristband Material: Silicone ; Screen:OLED Bluetooth:V2.1