Note: This device is for Sports and Aviation use only and not intended for medical use.If you have any comments or suggestions, please feel free to contact our professional after-sales service team. We provide solutions to your satisfaction. COMFORTABLE AND CONVENIENT: The patented ring oximeter is made of silica gel, which is soft and comfortable. INTELLIGTNT AND RECHARGABLE: Long battery life. It can be used for 16 hours after fully charged. EASY TO MANAGE: O2ring stores four sets of 10-hour data. It supports synchronizing the data to the software for management via Bluetooth. FREE APP: Data can be transferred to smart phone for more detailed information. It supports to share JPG or CSV records with others for free. RELIABLE AND ACCURATE: Continuously track Oxygen Level, Pulse rate and Perfusion index in every second.