Features: (double Strap Design) Fitness trackers with Heart Rate Monitoring Advanced visual sensors deliver precise cardiac data day and night, solving inaccurate nighttime tracking issues through upgraded algorithms for health awake users. Features multi sport modes (running/cycling/swimming), 7 day battery life via low power chipset, and silicone bands with double strap option for secure comfort during intense workouts. Ideal for fitness enthusiasts tracking performances , professional managing stress through health analytics, and travelers needing stable activity monitoring without frequent charging. Perfect for sleep quality optimization with auto cycle detection, outdoor adventures with IP68 waterproofing, and office environments through discreet shaking notifications. Engineered for seamless lifestyle integration sweat resistant construction pairs with business casual straps, while real time calorie counters sync with major apps via 5.0 connectivity. Specifications: Component : silicone Size: about 5x30cm/2x12inch Battery: included Package Includes: 1 set Fitness Band note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.