Description : A. 0.56 inch special red digital clock for display; B. Import AT89C2051 for master chip; C.1.2mm thick PCB made from grade FR-4 board; D. accurate travel time, travel time error range error -1 to +1 seconds every 24 hours. Specification : AT89C2051-based of four electronic clock kit Kit Model: YSZ-4 Supply voltage: 3V-6V PCB Size: 52mm * wide 42mm Function : 1. Seconds correction (for precise School) 2. Switch to every minute individual display interface 3. whole point of time (8-20 o\'clock chime can be turned off) 4. Two alarm settings (you can turn off the alarm function) Package Included: 1 x Electronic Clock moduleUnassembled Note : 1.This produce is DIY kits, not the end product! We don\'t provide technical assistance please make sure you are familiar with the product before purchasing. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data. _x000D_ _x000D_