Features: Perfect for beginners, this electronic soldering practice set includes pre designed PCB board, multicolor LEDs, and microcontroller chip for fast functionality without debugging ideal first project for circuit assembly. Features a heart shaped PCB (8x8cm) with seven color gradient modes and flowing water effects, combining uniform light diffusion with aesthetic layout for visual appeal. Designed for students and electronics enthusiasts seeking hands on soldering experience with through hole components like resistors and capacitors. Enhances as decorative display or practical learning tool for desktop arrangements, showcase window, and STEM education environments. Built with flame retardant PCB and expandable interfaces supporting 5V power input, ensuring durability while allowing customized programming for personalizing light patterns. Specifications: Component: ABS plastic materials Color: red\seven colors Weight: 80g Size: Approx.9x7.6x2.9cm/3.54x2.99x1.14inch Styles:As Picture Shown Package Includes: 1 Set PCB Solder Practice set note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.