Check the listing for details. Soldering Practice Board, 4 Set Electronics Kit Prototype PCB Board DIY, 4~12V. Condition: New. Listed at 20.03 USD. This voice control soldering kit electronics practice board is a teaching kit for people who want to improve the welding skills.The welding product is a beautiful water lamp circuit.Specification:Product:Electronic Production Teaching KitApplicable voltage: 4-12VPCB board size: 65*27*1.6mm/2.56*1.06*0.06inchEffect: rotating water lampPacking List: 4 Set Voice Control DIY Electronic Experiments Teaching Kit(1Set List: 1 * CD4017 integrated circuit, 1 * 16P socket, 1 * microphone, 1 * 9014 transistor, 1 * capacitor 100uf, 1 * capacitor 1uf, 11 * LED 5mm colorful, 2 * resistor 20k, 1 * 2M, 1 * 470 ohms, 1 * 200 ohms, 1 * PCB board, 1 * electrical box)Advantage :1. The voice control pcb board prototype kit is tinned, not easy to oxidize, high-strength fireproof, anti-drop material, can be disassembled and assembled repeatedly.