Check the listing for details. Soldering Practice Board, 2 Set Electronics PCB Board DIY Rotating Windmill. Condition: New. Listed at 13.08 USD. This LED rotating windmill soldering kit electronics practice board is a teaching kit for people who want to improve the welding skills.An interesting DIY welding kit that can be used as a gift.Specification:Product:Electronic Production Teaching KitApplicable voltage: 4-5VSize: 50*40*1.6mm/1.97*1.57*0.06 inchEffect: Funny PCB Adjustable Speed Rotating WindmillPacking List: 2 Set DIY Electronic Experiments Teaching Kit(1Set Packing List: 1 * Circuit board, 4 * Resistance 1K, 19 * 3mm red diode, 2 * Light touch switch, 1 * STC15F104 integrated circuit)Advantage :1. The pcb board prototype kit is tinned, not easy to oxidize, high-strength fireproof, anti-drop material, can be disassembled and assembled repeatedly.Can improve the welding skills of electronic professionals and enthusiasts.2.