【Key-Lock Design】 Dr.meter Lock Design ensure that child cannot get rid of anti lost wristbands unless parents unlock the lock (on the child's side) with 2 included keys 【2-pack Safety Wristbands】Two is better than one. Blue link can extend up to 8.2 feet, orange link can extend up to 4.92 feet. Both perfect for keeping little ones close by but with more freedom to roam. The upgraded extended cuffs' size will fit all wrists 【Comfy and Secure】Ultra-soft, breathable sponge padding and round-cornered velcro straps protects wrists from uncomfortable scratching and sweat while holding the safety wrist cuffs in place 【Rotatable and Reflective】Built-in reflective tape keeps your child safe in the dark, while a 360 degree swivel clip allows free and flexible movement. Your kids will stay safe without feeling constricted 【High Quality Steel Cord】The thickened steel wire is coated in great PU. It will recoil automatically but won't break, crack. It's a must have leashes for your feisty, energetic kids at outdoors