Features: High quality board,has clearly marked the electronics components,even beginners can easily solder successfully. This product is improved and optimized based on years of practical experience. The design of electronic parts is scientific and reasonable. Easy to use, simple installation. If it is used for a long for time, it is recommended to use for DC power supply. This product is absolutely affordable DIY kits, cost-effective, suitable for students DIY electronic production. This product is a DIY practice assembly kit, can fully exercise the hands and thinking ability, but also can learn more electronic professional knowledge. Specifications: Board Size:52 x 42 mm / 2.05 x 1.65 inches Note: Please allow 1-2cm errors due to manual measurement. Because of the different display of each computer, the pictures may not reflect the actual color of the item. Package includes: 1 Set Digital Clock DIY Kit