<b>This is a 3d wooden puzzle marble track run model. </b><br><b>Turn on the switch, put the marbles, the marbles will automatically rotate along the track, the castle will emit flash of light.</b><br><b>If you watch it roll over and over again for a long time, it might make you feel relaxed.</b><br><b>Dimensions :7.67×5.9×11.22in.</b><br><b>Number of pieces:70pcs</b><br><b>Recommended for age 14+. </b><br><b>About assembly: Easy to install without glue, because it provides detailed assembly instructions and tools (excluding 4 AA batteries),Battery transportation has safety issues, we hope you understand.</b><br> <b>CHOKING HAZARD -- Small parts. Not for children under 3 yrs.</b><br>