[RELIABLE MATERIAL] The cot mobile arm is made of high quality ABS material, with polished finish, which is firm, smooth and heavy duty. It is thicker than other cot mobile arms for a better loading capacity, guaranteeing absolute safety. [EASY TO ASSENBLE] The baby mobile arm is easy to install. Come with 5 parts totally, just simply connect them together, then install it on the crib. The base of the baby mobile arm can be adjusted by tightening the built-in screw to fit the cot. This baby mobile arm fit most of baby cribs. When you don't need it you can just take it apart for storing, saving space. [Built-in Musical Box] The cot mobile arm is equipped with a musical box that can make melodious sounds when the button is rotated. The light music helps your baby easier fall asleep. The mechanical music box does not require batteries, making it safer to use. [THOUGHTFUL DESIGNED] The cot mobile arm measures 23in/58cm. It has a built-in sturdy hooks that is strong enough to hold kinds cot toys, like dolls, musical box, bed bells, etc. [GIFT FOR NEWBORN] Our cot mobile arm is designed to hang toys or decorations, so that your little on can reach out to play with this character, which is great fun for them. And you can even hang the musical box on it to help your baby fall asleep in no time. With this cot mobile, babies no longer cry all day. It is a great gift choice for newborn. Warning:Do not carry loose in a pocket. Warning:Do not use during thunderstorms.