This is a DIY 4-digit digital clock kit. The circuit is controlled by a 51 microcontroller. It uses DS1302 as the clock chip and drives the 4-digit 1-inch digital tube to emit light through a triode. Luminous colors available. The chip comes with a program, and as long as there are no problems with installation and welding, it can be successful in one go. The kit is suitable for college teaching training, electronic interest training classes, and electronic hobby production. Complete set shipped in parts. Contains the circuit board, all components on the circuit board, including transparent case, USB power supply cable. Colour:Photo Color Material:abs Package Contents: 1 x diy digital clock 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.