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Rotate the top of Reminder-ring two quarters clock wisely, and face it to an object. The ring will emit a ray and mark on the object. This mark is made of a special sensing material. There is a specific sensor on the ring, which can perceive the mark and measure the distance between them. Once the distance is greater than 3 meters, the ring will vibrate and flash. So people can leave a mark on their belongings such as cell phone, wallet and key. For example, when the cell phone is was away from the user more 3 meters, Reminder-ring will tell and urge the users to find the object as soon as possible. If people want to erase the mark, they only need to face the ring to the object once again and rotate the top of the ring two quarters to the other direction.