1. [Before purchasing the body] Before purchasing, measuring your finger size perfectly adapt. We strongly recommend you to obtain the ring -sizing kit to determine the most comfortable and suitable size for your finger. To provide detailed data and information, download the JC Ring app in the Google Play and iOS App Store, matches the ring. Enjoy 7 days of real -time monitoring without additional costs. Green does not flash, please move the ring to the right position, the inner raised part of the ring corresponds to the groove inside the charging shell, the green light of the ring will always continue when fully charged. To introduce a special time schedule feature. Capture the wonderful moments of life, always make you feel like you have a digital day with you. Compared to voluminous smart watches and fitness bands, the smart ring is lighter and more comfortable, making monitoring effortless. It is designed for comfort all day and can be worn during training, sleep and daily activities.