Smart chipsWith powerful computing power and floating-point arithmetic technology, it achieves faster running speed, higher security, and longer transmission distance Sleep monitoringWhen you fall asleep, the ring automatically monitors your sleep quality and generates a sleep report to help you develop good sleep habits Heart rate monitoringThrough the combination of photoelectric sensors, accelerometers, optical heart rate sensors, optical blood oxygen sensors, and multiple sensors run synchronously Exercise monitoringYou can set a daily exercise goal, 5000-10000 steps, record steps, kilometers and calories at any time, apply different sports modes and open the exercise track on the APP at the same time, record the movement track of each time IP68 waterproofThere is no need to take off in washing, showering, swimming and other wading scenes, and it is not affected by sweat, and the physical condition under sleep and activity is continuously monitored Specifications: Material: Case - Stainless Steel Size: 7 (Inner Diameter 17.3mm), 8 (Inner Diameter 18.1mm), 9 (Inner Diameter 18.9mm) Chipset: AB2026B3 Memory (ROM + RAM): Max Frequency 120M, RAM 64KB Gravity Sensor: 3-Axis Pedometer Sensor SC7A20H Bluetooth Version: 5.2 Mobile App - GPS: Available Heart Rate Sensor: 3918 Battery Type: Polymer Lithium Battery Operating Temperature Range: 0-50 Battery Capacity: 18mAh Charging Time: 1 Hour Standby Time: 10-15 Days Usage Time: 3-5 Days Charging Method: Magnetic Charging Compatibility: Supports Android 5.0 and above; iOS 10.0 or higher App Multi-Language Support: Multiple Languages OTA Support: Supports FOTA upgrades Application: Da Rings Package included: 1 x Smart Ring 1 x Charging Cable 1 x English User Manual