Description: Color: blue, black, red (optional) Bluetooth: 4.0 Screen size: 0.96in Battery: 3.7V, 90mAh Theoretical standy time: 10 days Theoretical working time: about a week Waterproof: IP67 Package size: 140 * 80 * 50mm / 5.5 * 3.1 * 2.0in Package weight: 50g / 1.8ounce Specifications: Features: 1.High sensitive touched screen, can achieve various operations, information content, step, calories, distance, weather, heart rate and other functions to quickly view, thus opening intelligent life. 2.Made of thermoplastic elastomer, it is more comfortable to wear, double-breasted design, let you exercise without falling off. Recording hearrt rate is nice for knowing your health and exercise status, using reflection. Photoelectric signal detection principle records your heart rate, 24h continuous detection your heart rate. Automatically record the number of step, burn calories. 3.You can choose the exercise program that suits your life rhythm, Nothing is more than sweating after exercise. Sweating can relax yourself, stick to exercise, and make yourself a nicer self. The bracelet automatically detects your sleep and generates a sleep report. 4. With IP67 waterproof performance, let you enjoy the fun of life. 5.When you forget the time, the bracelet will vibrate gently, remid you to get up and wake up. Package Included: 1*Smart Watch 1*Charger 1*Instruction