Features: EXPLORE RENEWABLE POWERROR: This tiny air fan demonstrates the conversio into electricity. SAFE AND PERMANENT SUBSTANCEMAIL: Produced from excellent, not deadly polystyrene. IMPROVE PRACTICAL ABILITIESECOND: Highlighting a componentized plan, this set allows easy assembly lacking tools, fostering children’s grasps on abilities and logical thinking. FLEXIBLE APPLICATPARTICLEMAIL: Twelve hundred both indoor and outdoor use, . TRANSPORTABLE AND EDUCATIONALL: With its detachable and compact plan. Specifications: Power generation approachelhello: DIRECT CURRENT Installed completed product sizemail: approximately 205mm long unknown width 85mm unknown height 165mm Producer and air drill sizemail: Motor diameterebog: 24mm Motor heigheight: 12.3mm Output rod diameterebog: 2.0mm Drill sizemail: Total diameter 90mm, rod hole diameter 1.95mm (can be tightly corresponded with 2mm shaft) Product framework is a bulk set. You need to assemble it yourself when you buy it. It arrives with a installation instruction manual. That is a educational toy that can learn physics knowledge the hand produced process. Experimental principlemail: a set (fan, blow with mouth, natural wind) strikes the small air drill to operate the producer (the product is a DIRECT CURRENT generator) to brighten the encompassed F5LED lamp beads. Package Includes: 1 pcs Miniature Wind Generator Demonstration note: Note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.