Rounded shape to enhance product affinity, through the sos button to break through the side shape, enhance the product fun. A variety of back patterns increase the user's freedom of choice, and the sos logo is more prominent. The IC card slot is placed in the middle, which is convenient to take and conforms to the man-machine. The inner and outer rounded corners are finely lubricated to avoid scratching skin and clothes; The metal decorative strip naturally transitions between the upper and lower parts to enhance the overall texture. The fashion bag buckle is treated with high-light and bright edge technology, which greatly improves the fashion texture. The innovative hanging button type hanging head is convenient, firm and durable to hang. The card slot is placed on the side of the badge, which is easy to insert and take, and the card is better fixed in the frame to prevent falling and losing. The one-key call button is embedded and placed to avoid touching it when it is not needed. The charging port and the indicator light echo, and the charging state is clear at a glance. A variety of colors are available, and different experiences show different colors of electronic certificates according to the color preferences of different groups of people.