Equipped with Key Lock: The lock and key design provides extra security - once locked, the child cannot remove the bracelet until it is unlocked by the parent. 360 swivel: The 360 swivel head allows your child to play and run freely. You don't have to worry about your child tripping Soft and comfortable: The bracelet is made of high quality cotton, breathable and comfortable and fits children's hands. The size of the bracelet can be adjusted according to your needs EXCELLENT QUALITY: The anti-lost wristband is made of stainless steel wire and durable PU, which is harmless to human body and not easy to be cut by knives. It is perfect for children from 1 to 4 years old. Particularly suitable for autistic children.