Best Price Quality for a Joyroom Products Product Specifics: Chip: RTL8762CK Heart rate IC: BD1662 Bluetooth version: Bluetooth 5.0 Bluetooth effective distance: 8-10 meters Operating memory: 160KB Data storage: at least 7 days Battery capacity: 210mAH Standby time: stand for 30 days Use time: 14 days Waterproof rating: IP68 Charging method: magnetic charging Charging current: 5V -500Ma Software compatibility: iOS 8.1 or higher, Android 4.4 or higher Touch mode: full screen touch Screen size: 1.3 inches IPS square screen