Check the listing for details. Soldering Practice Board, 2 Set Electronics Kit PCB Board DIY Alarm Clock 5-12V. Condition: New. Listed at 19.45 USD. This 6-digit DIY alarm clock soldering kit electronics practice board is a teaching kit for people who want to improve the welding skills.This fun soldering practice kit can be used as a gift.Specification:Product:Electronic Production Teaching KitApplicable voltage: 5-12VPCB board size: 90*70*1.6mm/3.54*2.76*0.06inchEffect: 6-digit DIY alarm clockPacking List: 2 Set 6-digit DIY Alarm Clock DIY Electronic Experiments Teaching Kit(1Set List: 1 * circuit board, 2 * color ring resistance 10K, 8 * 470 Ω, 6 * 4.7K, 1 * switch, 4 * red LED, 1 * socket, 1 * integrated circuit, 6 * 8550, 1 * 78L05, 3 * capacitance 10UF, 1 * 220UF, 2 * 30PF, 1 * 104, 3 * diode, 1 * battery socket, 1 * crystal oscillator, 1 * wiring terminal, 3 * tube (3621BS-1))Advantage :1.The clock is powered by an external power supply.