[Product Description]: The scale of the circuit can produce different sounds while different keys correspond to different scales.The play of the electronic organ is to use the fingers to press different keys to produce different scales.The principle is that the circuit IC555 is connected to an oscillator whose oscillation frequency is determined by the resistance of the circuit (R1- R10) so different sounds will be generated due to different keys. [Presupposition]:Please read the product instructions carefully and compare the parts and component list which can be obtained from customer service. Remember to attach your order number or full name of the product to avoid confusing the instructions. Manufacturered by DDIY. [Applicable Crowd]:1. Student of circuit and electronic soldering 2. Interested in soldering and assembly 3. Strong hands-on ability 4. Experienced in solderingetc. [Warning]:This product needs to be soldered by yourself. If you have no soldering experience please read the soldering instructions and use soldering tools carefully in order to avoid safety problems.If you need instructions or have any questions about the product please consult customer service. [Product Parameters] 1. Working Voltage: DC 3-12V 2.PCB Size dimension: : 13.5*2.2CM 3. PCB Material: 1.6mm RF-4 Plate 4. Installation: DIY welding assembly 5. Type: Logic ICs Operating 6. Temperature: -30-85.