ns in infants and young children. It mainly manifests in speech development disorder, interpersonal communication disorder, narrow interest and rigid behavior. About 3/4 of the patients were accompanied by obvious mental retardation, and some children had better ability in some aspects under the background of general mental retardation. Silicone bracelet is not only used as promotional gift, but also as a medical tool. Autism awareness bracelet is commonly used. It is a high quality silicone bracelets with the ID printed on. We can print bar code, QR code or unique serial number together with some detail of the medical institute. Usually the wristband width need at least 15mm so that the code is clear enough to be scaned. When you scan the code with a phone, the detail of patient name, address, status will show up. It is acustom lanyard keychain good help for doctor and patient to know the treatment. All the medical bracelets should made from 100% silicone. If the bracelet is embeded with a chip, it will note down the information of exercise, heart beat and sleeping. Then trafer it to the phone app. It contribute to health care. custom lanyard keychainon-wristband.com/where-can-i-order-rubber-wristbands" target="_blank"> . Black and white stand for standing up and speaking up. Blue stand for beatting bullying. Pink stand for supporting knowledge strength. Blue and white stand for one world one cause Blue and green stand for say no to sectarianism. Also a silicone bracelet can be used as a promotional item for entertainment or sport. It is hot sale as a advertisement gift. Most of the silione bracelets are of no meanings , people wear it just as a popular jewellery. After proper dewatering , the silica gel mSiO2?nH2O become a porous mass that is of different particle size. This is so called the silicone. The silicone has the open vesicular structure , large specific surface. So it can absorb many substances as a good desiccant, adsorbent and catalyst carrier. Adsorption of the silicone is mainly the physical one that can be regenerated and good for repeated use. Let the silica gel soak in the cobalt dichloride solution then get it dried and activated , will become the allochroic silica gel. It will transfer from blue to red color when absorb water. Changes in color shows the degree of water absorption and whether need the regeneration treatment.