Assemble the wooden puzzle according to the detailed instructions, and experience the fun of DIY model. Made of high quality basswood laminate, good wear resistance, not easy to break, safe and eco-friendly. After making, rotate the top cover wheel, you can open a very small compartment to store ring or coin. On the left and right of box are the week and date functions. The big top cover of the password treasure box can be opened to store small items. Just turn the front knob to the correct password and turn the "on" gear to open the top cover.(Note: The password needs to be set with 3 numbers.) This is a great challenge for you. It takes only a little patience to complete this 3D wooden puzzle. Once completed, you will feel proud and happy. Best gift for students, children, family, colleagues, friends, lover.