Smartwatch CHT-B19-BK High-Resolution AMOLED Display Accurate GPS Tracking Marathon Mode 14-Day Battery Life```html Product Highlights Ultra High Precision GPS PositioningWith a 3D floating antenna and smart X DR positioning algorithm, positioning accuracy is improved by 20%. Even in environments where GPS signals are prone to interruption, such as tunnels and high rise buildings, it accurately tracks routes, distances, and speeds, providing reliable data for pace feedback, training load, and running ability assessment. Offline maps allow for accurate