How to Use: 1. Take out the product. 2. Connect the receiver to the computer, etc. 3. If no, reinsert or restart the PC. Specification: 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. Package List: 1 x Keypad1 x Mouse 1 x Receiver