The green light flashes mean in charging, and a solid green light on mean full charge. The longest charge time is less than 2 hours; after full charge, it is recommended to remove the ring from the charging adapter in time to prevent battery wasting for solid green light reason; the battery is fully charged and can be used 14-16 hours continuously, if the ring power is too lower, it will stop monitoring and affect data upload, and it can recover after charging again.