Welcome to ours shop! Band material: silicone Screen size: 1.85 inch square screen Shell decorative parts: zinc alloy Charging mode: magnetic suction line Compatible system: android 5.0 or android 9.0 above, support bluetooth 4.0 Monitor basic runners, people who run for fat loss, partners who need endurance improvement and cardiopulmonary exercises; Support multiple exercise modes, running, jumping, sitting and more than 100 sports, accurately record exercise time and running step count in real time. Make the waterproof life, you can wear hand washing, face washing, swimming, etc., sports sweating does not need to worry, the strap is made of skin-friendly silicone, lightweight and comfortable, waterproof and wear-resistant. Keep the bracelet connected to the app, smart alerts, accept SMS alerts, incoming call reminders, social class app reminders, etc., don't miss important messages, powerful functions, the personal assistant in life. 100% Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.