for Clockwork Musical Mechanism Movement for DIY How to use:Screws the key underneath the movement,it will ring after you wind up the key You can install the movement into a DIY box,such as paper box,wooden box,glass box,plastic box and metal box,you can create your own A cute gift for yourself or your friends,hope this can bring you happiness and wish you enjoy a music life! Note:You have to place it on a flat for volume to be loud