Feature: 1. Wireless numeric keypad, calculator function + keyboard function, long press NUM to switch between calculator mode and PC keyboard mode. 2. 20 independent buttons with backspace key, convenient and quick to input and modify, the F icon on the display is always on in the calculator mode, and the icon on the display is always on in the PC keyboard mode. 3. Small and portable, it can be placed in the bag at any time, suitable for notebooks, desktop computers, and financial forms. 4. 2.4G wireless connection, stable transmission distance of 6‑10 meters, plug‑and‑play without driver, convenient and quick to use for notebook and desktop computers. 5. Built-in drainage design, when a large amount of water splashes on the keyboard, the surface of the keyboard can drain the water instantly, which is safe and worry-free. How to Use: 1. Insert the battery (battery purchased separately). 2. Remove the receiver, insert the USB port of the computer and other equipment, the receiver will be installed automatically. 3. Start to use after pairing successfully. Specification: Item Type: Wireless Calculator Material: ABS Product Size: Approx. 140x83x26mm / 5.5x3.3x1.0in Connection Method: USB connection Number of Keys: 20 keys Support System: For Windows XP/win7/win8/win10 Transmission Distance: 6-10m / 19.7-32.8ft Keyboard Battery: 1xAAA battery (not included) Package List: 1 x Manual 1 x Receiver 1 x Wireless Numeric Keyboard(Battery Not Included)