1. Composed of special circuit boards, digital tubes, microcontrollers, buttons and other components;with stable product performance and long service life. 2. Supports Type-c power interface DC5V power supply or button battery power supply. The battery installation port has a hole on the side for easy removal of the battery. 3. This kit can not only perform mathematical calculations of addition, subtraction, multiplication and division, but also convert color ring resistor values. It is a multi-functional product suitable for electronics enthusiasts to practice welding and learn to use. 4.The digital tube display calculator production kit can not only realize mathematical calculations of addition, subtraction, multiplication and division, but also can convert the resistance value of the color ring resistor. Suitable for welding practice, electronic training, experiments and other purposes, very suitable for DIY enthusiasts. 5.Perform addition, subtraction, multiplication, and division operations. It supports calculations with up to 6 digits. If the calculation result exceeds 6 digits, if it is a decimal, only the first 6 digits be displayed. If it is an integer, scientific notation be used. Indicates that the maximum number is 9.99x1011; Product name: Digital tube display calculator kit Working voltage: 2.8V Type-c power supply voltage: DC5V Button battery: 3V Power supply mode: Type-c interface power supply or button battery power supply (Note: Type-c and button batteries cannot be powered at the same time, otherwise the button battery be damaged) Button battery model: CR2032 Digital tube display: six digits Working current: 9mA Sleep state: Less than 1mA Installation tutorial: https://.bilibili.com/video/BV1GC4y1g781/? Copy to your browser to watch the video tutorial Notice: 1.This product is a DIY kit, not a final product. It is shipped in parts and needs to be welded by yourself. 2.This welding project requires basic electronic knowledge and hands-on ability. Colour:Photo Color Material:plastic Package Contents: 1 x Diy Electronic Calculator Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.