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[Multiple Sports Modes] over 10 sports activities like running, cycling, and swimming, with precise activity route and calorie tracking on your wrist. [Lightweight & Durable] Weighing only 25.5g and crafted from quality stainless steel, this wristband offers comfort and style, blending seamlessly into your daily routine. [Long Battery Life] High capacity battery lasts over 5 days, with magnetic fast charging for convenience and efficient power replenishment. [Waterproof​ Design] With a 50m water rating, enjoy flexibility during daily activities, rain, or swimming without fear of water damage. [Advanced Sleep Tracking] Intelligently monitors sleep stages and duration, providing personalized suggestions to enhance sleep quality and daily energy levels. Spec: Item Type: Smart Bracelet Material: Stainless steel + alloy Body Capacity Memory (ROM + RAM): 160kb ROM + 64 Kb RAM Sensor: SC7A20H ​ Version: 5.1 Battery Capacity: 16mah lithium ion battery (shipped with built in battery) Charging Time: 1 hour Theoretical Standby Time: 16-20 days Usage Time: 4-5 days Package List: 1 x Smart Bracelet 1 x User Manual How To Use: Open and ready to use