Make every beat count with F4 smart bracelet - the round colorful digital display and heart rate with advanced blood pressure calculator a fitness wristband built for all-day, workouts and beyond. It provides everything you need to be updated as well as be one step ahead in technology. The smart band magnetic charging cable support any mobile charger and its 150mAh polymer lithium battery gives you 15 days good battery backup you can Sync its history but only supported to Android Phones or iOS devices for which you need to download the Sport/Yoho Sport app. The box contains - F4 smart bracelet + user manual + magnetic charging cable. Warrant period - The smart bracelet having a 6 months warranty .