1DIY Kit: Decimal counter, must be soldered and installed by yourself. Suitable for electronic beginners, hobbyists, students to use in welding assembly training 2Application: This book can be used for skill training, skill inspection, training, and can also be used for self study electronic technology assembly in schools or electronic enthusiasts 3Wide Application: This kit can be widely used in schools to help students learn basic mechanical and electronic skills, easy to use 4Basic Specifications: The power supply voltage supply voltage is 35V DC voltage, and the board size is 4.2 x 5.2cm 5Button Function: This decimal counter set has reset function, the number starts from 0 when the button is pressed Item Type: Decimal Counter Kit Material: ABS Supply Voltage Supply Voltage: 3-5V DC Voltage Board Size: Approx. 4.2 x 5.2cm or 1.65 x 2.05in Button Function: Reset function, the number starts from 0 when the button is pressed 1 x Decimal Counter Kit