This unique & exquisite Pendulum Clock is a spring-driven mechanical gears 3D wooden puzzle. Let's witness the passage of time with the rotation of mechanical gears. This mechanical wind-up Pendulum Clock LK501 is a real wooden clock that can actually work! This stylish spring-driven clock 3D wooden puzzle will provide you with an amazing building experience. Assemble all the pieces & mechanisms together and watch how it works. Best mechanical gears 3D wooden puzzle kit for your kids, boyfriend & husband. REAL PENDULUM: A gravity-swing pendulum with precise anchor escapement 3 HOURS TICKING: It can actually work for around 1-3 hours when finished! STYLISH OUTLOOK: Appealing home decor for room or office CHALLENGE YOUR MIND: Fun of kits building & brain-teasing of mechanical engineering PERFECT GIFT: Gift for mechanical lovers or family & friends on any occasion like birthday, father's day, or Christmas. *Notes: Due to customs policy, the wax may not be included in the package. Wax: you could use ordinary candles, crayons, beeswax, etc.