Dimension: approx. 12cm*7cm*3cm(4.72"*2.75"*1.18") | Material: Eco-Friendly ABS and metal music movement inside | How to use: the sound power from spring, use the key to turn the spring tightly, then release and will be playing | It can help to pacify crying baby and enhance your baby's cognition of music. You baby will fall into sleep along with soft and beautiful melody. | Hanging loop at the top, music box can be fixed. Easy to clean, washable with a damp cloth.