1. Uses straight-in components, easy to solder2. LED display to show the data clearly.3. Pre-programmed design for easy operation.4. Includes add/subtract/multiply/divide/negative number/the decimal point function.5.Auto power off in 20s if there is no operation.Power Supply: CR2032size:PCB Board Size: 8.8 x 8cm / 3.46 x 3.15inchFinished Product Size: 9.8 x 9 x 1.6cm / 3.86 x 3.54 x 0.63inchType:DIY Calculator Kitcolor:As shownMaterial:Acrylic+PCBPackage Contents:1 x DIY Calculator KitOnly the above package content, other products are not included.Note: Light 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.