Xiaomi Smart Band 9 Active Strap Luminous. Easy to remove, stylish and versatile TPU block colour strap. Radiate confidence and energy with fashionable and dynamic colours to give you a lift. Made with soft, skin-friendly TPU material for your comfort. Colours Available: Yellow, Luminous. Your trusty companion: the unique luminous strap absorbs light during the day and glows in the dark, ensuring you are more visible for safer evening runs.