Features: The laser harp can play- melodys by waving the string-beam; There are 7strings in total, and the horn emits the corresponding scale when cutting the-strings; After assembly, you can switch- the high, middle and low voice-color by pressing the key-to play- the stored two songs; For those who like DIY, this is good small production; This is an interesting electronic welding-kit, which is very suitable for electronic enthusiasts and beginners to learn welding-skills and abilities. Specifications: Material:PCB- Voltage:DC5V PCB-Size:Approx.98.6mmx40mm/3.88''x1.57'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Set Laser Harp Kit