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Blue LCD display with auto power off function in 30 seconds. Function: 1: Decimal arithmetic operation with decimal point and negative numbers calculations. 2: Calculation of 4 ring resistance or 5 ring resistance. 3: The calculation of LED diode current-limiting resistance. 4: Decimal number - hexadecimal number conversion and hexadecimal number - decimal number conversion. 5: Square root calculation.Specifications: Material: Acrylic Board + PCB Board + Electronic Components Power Supply: 2 * 3V CR2030 Button Battery (NOT Included) Auto Power off: In 30s without Operation PCB Board Size: 120 * 68mm / 4.72 * 2.68in Finished Product Size: 131 * 91 * 37mm / 5.16 * 3.58 * 1.46in Product Weight: 187g / 6.60oz Package Size: Approx. 15 * 12 * 4cm / 5.91 * 4.72 * 1.57in Package Weight: 197g / 6.95ozInstallation Method: You will get a bulk DIY kit, all components need to be soldered by yourself. The shell is acrylic material, fixed with screws. Provide with installation instructions.Package List: 1 * DIY Calculator Counter Kit (Battery Not Included) 1 * User Manual (English)