This anti-lost wrist band is suitable for 1 to 5 years baby. Please attach one end to child and another end attach to adult's wrist. It can help you keep your child near with you when you are traveling or shopping. Keep toddlers close to you and at the same time give them independence during indoor or outdoor activities. The shrinking chain can extend up to 1.5 meters and the wrist strap circumference of kids hand side (the smaller side) can be adjusted up to 5.5". The connecting rope is made of stainless steel and wrapped with plastic, never worry this safety harness will be cut by knife. It is linked to the wrist straps with metal connectors that can freely rotate 360 degrees.