1. Gift for Baby CotBaby crib mobile bed bell Arm Bracket Set including 1x Bracket base (including nut and screw);1x straight bar;1x curved bar;1x cross;1x Mechanical Hanging Ling.Baby crib mobile hanger is made of ABS material in white, harmless to the baby. 2. Easy to InstallSplice each pieces very easy to operate, you'll get one brand stable baby crib mobile with holder arm bracket and windup musical box. 3. Promote Hearing and VisionWhile playing music, the Baby crib mobile bed bell's hook can be rotated 360° to drive the ornaments to attract the baby. This musical cot mobile not only improves the baby's hearing and vision, but also soothes the baby's mood and assists sleep, promotes the baby's healthy development and intellectual development, and opens up to the exploration of unknown world. 4. Help LearningListening to music will help teach your infant about patterns and sequence, and about rhythm, beat and tone which are useful for problemsolving and reasoning.