Features： 1、Remote Control: The crane model is driven by wire remote control, and can start and stop freely. It has double lifting points and double observation hole design. 2、Brain Game: When assembling this set of 3D wooden puzzles, it will enhance children's basic science knowledge, improve their hands on ability and imagination, and stimulate interest and curiosity. 3、Fixed Pulley Drive: This model is driven by a fixed pulley block, and the lifting is realized by the tower crane's own structure and pulling rope. 4、Composite Wood: The puzzle parts made of composite wood can be spliced many times and are not easy to break, so you can play them many times. 5、 Holiday Gift: This DIY kit is the gift for kids. After safety testing, all wood blocks are made of wood, without chemical treatment, non toxic and non irritating, creating a safe entertainment environment. Specification： Item Type: Wooden Crane Model Material: Composite Wood Power Supply: Remote control (2 x AA battery, excluded) Uses: Handmade, puzzle teaching Package List： 1 x Remote Control 1 x Worm Gear 1 x Motor 1 x Motor Clip 1 x Hook 1 x Nut 1 x Cotton Thread 1 x Major Axes 2 x Middle Axes 2 x Short Axes 3 x Belt Pulley 1 x Gearwheel 12 x Axle Sleeve 28 x Screw 1 x White Glue 1 x Screwdriver 1 x Sand Stick 4 x Board