Power options: supports TypeC power interface with a DC5V supply or button battery power. The battery installation port includes a side hole for easy battery removal. Multifunction digital kit: a digital tube display calculator production kit that can perform basic arithmetic operations (addition, subtraction, multiplication, division) and can convert resistor values using color codes. This makes it useful for both calculation tasks and resistor value decoding. Practical applications: suitable for welding practice, electronic training, experiments, and various DIY projects. A versatile tool for electronics enthusiasts to learn, practice, and build. Build and durability: composed of specialized circuit boards, digital tubes, microcontrollers, buttons, and other components, delivering stable performance and long service life. Use scenarios: Electronics education and classroom practice for arithmetic and resistor colorcode conversion. Handson soldering practice and learning to use electronic components in DIY projects. Quick circuit testing and value conversion during experimental exploration and prototyping.