UGears 20-Minute Mechanical Timer Wooden Puzzle — Rubber-Band Powered Clockwork

A wooden mechanical timer that runs like clockwork and sounds a pleasant pop after 20 minutes. Powered by the pull of a simple office rubber band, the Timer features a unique roller pendulum and a lever for amplitude adjustment on the back. The model demonstrates mechanical motion and provides a meditative ticking rhythm. Size: 6.9 x 3.3 x 10 in. Package size: 14.8 x 7.5 x 1.2 in. Number of parts: 107. Level: Hard. Assembly time: 3–4 hours. Recommended age: 14+. Kit weight: 1.50 lbs.