Features: It is a YunSheng wind up black silver 18 note musical movement that use for either a wind up wooden piano music box or use for DIY your music box, it is very easy to setup. The sound power from spring, use the key to turn the spring tightly, then release and will be playing. The full playing time will be 3-4 minutes, if you are tired with hand crank music box, then this windup music box can surprise you and make you relaxed! One music box can just play one song. We have many songs and many kinds of music boxes for sale, you can visit our store to choose the one you want:) Do not hesitate to purchase this for yourself or as a gift. Our music box is quality made, pure sound, no noise, no out of tune! Package Content Music Box movement*1 + Key*1 + Screws*2