Operating system Android Special features Activity Tracker Connectivity technology Bluetooth Wireless communication standard Bluetooth Battery cell composition Lithium Polymer About this item Elegance and colour on your wrist. Enjoy a vibrant and metallic design with an aluminium alloy frame that adds a refined touch to your style. Available in four iridescent color options, the quick release structure allows for easy strap change for any occasion. Advanced precision technology. Experience a more accurate measurement with the PPG double channel configuration. Equipped with a 2-channel PPG sensor, this device improves the accuracy of heart rate and SpO2 monitoring and provides up to 10% more accurate tracking than its previous version. Long battery life. Forget about constant charging. With up to 21 days of battery life in normal daily use, this device outperforms its predecessor by 30%. You can also enjoy the convenience of fast charging, which completes charging in just one hour. Comprehensive health monitoring. Stay in tune with your well-being through an advanced health control system. From heart rate and SpO2 to sleep and stress levels, this device gives you detailed sleep scores and recommendations to improve your daily habits.