Retro Wind-Up Wooden Piano Musical Box,Wooden Simulation Gift Music Box,Amazing Grace Musical Box&pound;&not;with Gold-plating Movement in,Black The song is Amazing Grace Manually to rotate the clockwork clockwise,and then release,the music will be playing The longest last time is 4 minites 30 seconds Size:15.5cm*13.5cm*10.5cm It is a wonderful gift music box for ourselves,children, parents and friends