Up to 21 days battery life: Outstanding robust carrying capacity with up to 21 days battery life. Thanks to the innovative reliance on a high-silicon battery, the energy density is increased by 37%. Leave energy concerns behind, and set out to break new records. * Wrist circumference: 140–210 mm | Wide-scale compatibility: Huawei GT6 is compatible with both iOS and Android systems for greater ease of use. Measure the power of your bike from the wrist: You can ride your bike freely, while enjoying science, safety and comfort at the same time. The developed Huawei Sunflower positioning system achieves 20% higher accuracy, leveraging enhanced Global Navigation System (GNSS) algorithms and antenna design. Promote overall emotional health: The watch classifies your emotions into 12 minute states across multiple levels, and displays them in a variety of flower shapes. To nurture the seeds of your feelings so that they open up and flourish. Smart experiences for an easy life: You can make and receive Bluetooth calls right from your wrist. You can also use the up and down buttons to take a photo, and share it in your mobile gallery. Besides taking a perfect selfie using your phone and controlling it directly from your wrist.