Features: Durable Material: Clipboard is made of quality plastic material, durable and waterproof. It is very solid and not easy to deform or damage and provides smooth writing surface. With Solar Charging Calculator: A calculator is installed above the low-profile clip, which is wide enough and easy to clip A4 papers. The batteries in the calculator are included and it is also solar-powered, so there is no need to worry about the battery drying. Humanized Design: File clipboard has a clip at the side of the calculator to keep your pen or pencil in place, which much save the for time and space to storage it after using. It also comes with scale lines on both sides of the clipboard for your convenient work. Portable Size:35 x 23 for cm / 13.7 x 9.0 inch, A4 letter size. Fit for A4 paper perfectly. The clipboard is lightweight and slim for easy carrying to everywhere. There is a hanging hole at the back of the clipboard, it is so easy and convenient to use. Widely Use: Perfect for students, teachers, doctors, nurses, business workers, salesman, etc. for Ideal for business, conference, meeting, outdoors, indoors, business travel, class, etc. Specifications: Material: Plastic Size: Approx. 230x350mm/9.06x13.78 inches Color: Black, White Package Includes: 1 Piece A4 Plastic Clipboard with Calculator note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.