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Features: 100% brand new and high quality This is a set of electronic components that you can use to DIY clock The kit has many LEDs which can make your clock quite special Connect to 5V voltage as power supply, and 3V button cell can be used for clock chip on backup power board Convenient to use, it is a great set for 51 MCU learners Specifications: PCB Thickness: 1.6mm/0.1in Material: FR4 military grade Digital Tube Display: Red Power Supply Voltage: miniUSB, external connection to 5V Battery: CR2032 button cell (NOT included) Assembled Size: 8.5*8.5cm/3.4*3.4in Weight: 72g(approx.) Package Includes: 1 x Clock DIY Kit (clock case and battery are NOT included)