Item Type: Number Pad Material: ABS Color: Black Battery: Mouse: AAA x 2 (Battery Not Included), Keyboard: AAA x 1 (Battery Not Included) Wireless Transmission Frequency: 2.4GHz Interface: USB Keyboard Keys: 18 Keys Number of Keys: 4 Keys Operating Distance: Approx. 10m / 10.93yd Optical Resolution: 1200DPI Purpose: Lightweight, Portable, Can Be Used for Notebook Computers, Accounting, Banking, Securities, Etc., with Its Own Receiver, Intelligent Power Saving. 1、Plug and play: This number pad and mouse combo is plug and play, there are no drivers to install, providing more convenience. 2、4GHz Wireless: This number pad and mouse combo adopts 4GHz wireless technology which ensures more stable performance. 3、1200 DPI: 1200 DPI responsive mouse provides one click with a flexible dot, Improving the efficiency of your work. 4、Portable Size: This number pad and mouse combo is small and portable, suitable for home, office and travel. 5、Wide Compatibility: This number pad and mouse is suitable for Win 2000, for Win XP, for Win Vista, for Win 7, for Win 8, for Win 10 operating system.