Children under the age of 50 have serious psychological disorders due to fear of injections, and cannot adhere to long-term treatment and have poor compliance; the unique hidden needle design of the Saizen hidden needle electronic pen makes the needle invisible during the entire injection process, eliminating the need for injections. Fear, improve medication compliance and ensure efficacy. In addition, the "fish"-shaped design of the electronic pen allows children to hold it with one hand. The hidden needle structure increases the contact area between the injection pen and the skin, making the injection smooth and avoiding the risk of needle breakage. The maximum injection dose of the mechanical pen is generally only about 2mg. For heavier children, two injections are required, and the dose needs to be adjusted manually for each injection, which is prone to deviation; the maximum injection dose of the Sazen electronic pen is 3.3mg, which is sufficient for most children. According to the needs of some children, there is no need for a second injection and it is more accurate. The unique memory function eliminates the need to adjust the dose every time and can automatically make up for the insufficient dose of the previous injection. It is the only injection device that meets the long-term treatment needs of all children. The needles of the Saizen Hidden Needle electronic pen are of the best quality in the world. The needles used in ordinary disposable syringes or prefilled syringes are 12.7mm in length and 29G in thickness; the needles of the Saizen Hidden Needle electronic pen are 6mm in length, which is shorter than ordinary needles. Double the thickness, the thickness is 32.5G (the larger the number of G, the thinner the needle); the longer the needle, the easier it is to break the needle, and the thicker the needle, the stronger the pain. The Sai Zeng Hidden Needle electronic pen has the thinnest needle, which can effectively reduce pain and give The best injection experience for patients.