This digital clock is a diy kit and needs to be installed by yourself. A very good choice for those who like to solder or who want to practice soldering. Single chip microcomputer:IAP15W413AS,Clock IC:DS1302.5ppm high-precision crystal oscillator, plus time error correction function, constitute a high-precision clock. 7 colors can be set for this clock, and time, temperature, date, day of the week and cycle display can be set respectively Color display: 4 nixie tube color optional; Each nixie tube color is optional; 4 nixie tube color cycle change (default); 4 nixie tube colors change randomly. The color of a single nixie tube changes randomly; Time correction: correct time error. Display mode: only (default); Time-temperature cycle display; Time-date-week cycle display; Time-date- cycle display. Material: plastic colour: As shown Package Contents: 1 x soldering practice 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.