Description: Comfortable: With a solid and durable structure, this numeric keypad produces low noise, offers comfortable press feeling and precise control, and rubber pads on the back securely keep the keypad in place. 19 Number Pad: Supports , Home, Tab, etc. 3 Colors backlight, waterproof. Easy to Use: does not require any device drivers, plug and play, no delays and dropouts, fast data transmission. Widely Compatible: Suitable for most kinds of laptop PC and computers. Portable Keypad: Compact, lightweight, great for business trips, travel, daily use. Specification: Number of Keys: 19 Connection Mode: Wired Working voltage: 4.5V-5.5V Interface Type: USB Cable Length: 1.5m Material: ABS Plastic Model: NMD-520i Light Color: Blue Purple Red Size Chart: Number Pad: 16cmx9.5cmx3.1cm/6.30inchx3.74inchx1.22inch Cable Length: 150cm/59.06inch Package Includes: 1 Piece Number Pad with Cable Note: Please allow slightly errors due to manual measurement and different monitors.