It requires 4 AA batteries and will swing until the battery runs out or you stop it. Made of high quality material, safe and smooth to touch. Perfect
Okuyonic Perpetual Motion Model, Electronic Shake Wiggle Device Perpetual Motion for Home Decoration Office Decoration(C205)
Are perpetual motion machines possible?
Perpetual motion - Wikipedia
Perpetual motion - Wikipedia
Roll up, roll up to see the Irish perpetual motion machine!
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Kinetic Art Perpetual Motion Machine,Silence Physical Balance Kinetic Energy Model Swinging , Decompression Cycle Ornaments, Children's Adult Art Craft Decoration,New Upgrade Quiet (Black-2) : Toys & Games
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Toontrack Hybrid Harp EKX
Are perpetual motion machines possible?