For a classified ad for the Amazfit Helio Strap: Amazfit Helio Strap – Smart Band for Health and Fitness Tracking A light and comfortable sports strap from Amazfit, designed to monitor health and sports indicators throughout the day, suitable for exercise, sleep, and daily use. Features: * Heart rate monitoring. * Blood oxygen level measurement and monitoring (SpO2). * Sleep tracking and its stages. * Recovery and stress monitoring. * Suitable for sports and exercise. * Light and comfortable design for long-term wear. * Works with the Zepp app to review data and statistics. * Comes with a charger. 300 is the limit WhatsApp contact only.