Mechanical Shark Building Set with LED Lights - Movable Crank Gears,687 PCS

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• 【BIOMECHANICAL SHARK DESIGN】 This 687-piece mechanical shark building set combines a lifelike ocean predator with exposed gears, detailed mechanical parts, and green LED lighting. Its striking mechanical aesthetic creates an eye-catching shark model for a desk, bookshelf, office, or display case.
• 【CRANK-POWERED SWIMMING MOTION】 Turn the knob on the display base to activate the interlocking gear system. Three connected body sections move together, driving the shark’s head, body, and tail in a fluid swimming motion that brings the mechanical model to life.
• 【INTERACTIVE SHARK DETAILS】 One side presents the shark’s finished exterior while the other reveals its intricate mechanical structure. An opening mouth, pointed teeth, adjustable fins and tail, and an integrated LED light add realistic detail and interactive play after assembly.
• 【REWARDING 687-PIECE STEM BUILD】 The detailed building process offers an engaging hands-on challenge that encourages concentration, patience, problem-solving, and creativity. Once assembled, the shark measures approximately 9.45 x 4.72 x 9.06 inches for an impressive yet space-friendly display.
• 【DISPLAY STAND INCLUDED】 The dedicated stand securely supports the completed 3D shark model and showcases its mechanical movement and illuminated details. A distinctive birthday or holiday gift for kids ages 8 -12+, teens, adults, shark fans, engineering enthusiasts, and model collectors.