Features: Learn individual-assembly soldering skills with this rotating music box set, featuring vibrant multi color LED lights, 6 enduring melodies, and adjustable rotation speed for a fascinating STEM learning experience. The innovative spatial PCB structure with acrylic casing ensures durability, while bottom light projection and high brightness LEDs create mesmerizing visual effects that sync with ballet dancer movements. Perfect for electronics enthusiasts, STEM educators, and families seeking hands on educational projects that combine circuitry fundamentals with artistic creativity. Display as an eye catching desk ornament during study practice periods, use in classroom STEM workshops, or gift as a unique birthday present that blends technology with decorative charm. Engineered with screw stacked copper pillars for stable multi layer assembly, this music box offer standalone music/rotation controls and replaceable batteries for extended interactive enjoyment. Specifications: Set name: HU-081 LED ballet girl rotating music box production set Working electrical potential: USB DC5V powered greatest working current: about 200mA (music on, motor opens and rotates the fastest) Appearance dimensions: about 103.2x103.2x145mm, manual measurement may have some errors Full set of weight: 220g Package Includes: Music Box Production Kitx1 note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution