I created this product listing on 15th Sept, for those customer who comes from Steve Mould's youtube video. Some people do not use Et sy, that is why I create this Amazon product. Please read this description carefully. ►►►This product is a Perpetual Machine Simulator, it is not a Perpetual Machine. It NEEDS battery to power up (battery NOT included). ►►►This listing is a Hand made item, Made-to-order type, which means after you make your purchase, I will then actually start to work on making your unit. The video and photos above is taken with a specific sample. Your unit will look almost the same, but can not be identical. Every pieces of wood is different. So please expect a small different in color/grain pattern. ►►►Product Details: - Material: the Wooden parts are made of PAU ROSA, a premium quality & rare exotic, imported from Africa. The wire is made from Stainless steel. The Ball is made of Steel. - Runtime: 5-6 hours (continuous - when the Battery is fully charged). - Dimension: 22x20x12 cm (LxHxW) - Weight: 1.2kg (without accessories) - Accessaries: The machine comes with a charging cable and 5 steel balls. Charging adapter and battery are NOT included. ►Battery needed: Lithium 3.7Volt 18650 rechargable, must be Flat-top type. I recommend to use Batteries which is less than 3000mAh in capacity. - Example purchase link: https://www.orbtronic.com/samsung-18650-30Q-3000mah-15a-high-drain-battery-flat-top ► Adapter Charger: universal 5-Volt USB adapter which is used for smart phones.