Based on retro-style mechanical timepiece, LK501 features a precise pendulum mechanism which requires more attention and patience. - a gravity-swing pendulum with precise anchor escapement - appealing outlook of mechanical engineering - perfect gift for mechanical lovers or family & friends - Wood pieces: 170pcs - Assembled Size: 234x117x346 mm - Packaging Size: 357x235x46 mm - Weight: 1250g - Type: Windup - Estimated assembly time: 5 hours. - Age Range: 14+ years old - If you assemble the product correctly and use the wax inside to reduce the friction between wood board properly, the clock will run for 1-3 hours.