Features: 1.Mechanical Linear Action Switch: The key switch structure is mechanical, and the Mechanical Linear Action Switch structure has an excellent feel so it operates quietly compared to other mechanical keys. 2.20 Key: 20 key mechanical numeric keyboard, plug and play, USB interface, no driver required, multi system compatibility. 3.Function: Splashproof, mechanical Linear Action Switch, with Esc key, with F1 to F6 key, with Enter key, with clear key, four large nonslip feet at the bottom. 4.Long Service Life: laser engraved characters, not easy to be erased, long key life, comfortable key hat, key life more than 50 million times. 5.Scope of Application: Number pad is suitable for different scenarios such as business, industrial control, audio visual education, security, road and bridge, and securities. Suitable for laptop users, suitable for banks, financial security, business people. specification:Item Type: 20 Key Numeric Keypad Material: ABS Model: DX 20A Keys: 20 Keys Plug: USB Cable Length: Approx. 1.4m / 1.5yd Type:Linear Action Switch Mechanical Numeric Keypad Key Structure: Mechanical Linear Action Switch Button life: >50 million times Voltage: DC 5V Current: 60mA Product Size: Approx. 140 x 102 x 25mm / 5.5 x 4.0 x 1.0in Function: Splashproof, Mechanical Linear Action Switch, with Esc key, with F1 to F6 key, with Enter Key, with Clear Key Applicable: Business, Industrial Control, Audio Visual Education, Security, Road and Bridge, Securities and Other Different Scenarios Support: For DOS, for Windows 95, for Windows 98, for NT, for ME, for 2000, for 2003, for XP, for VISTA, for Windows 7, for Windows 8, for Windows 10, for Linux, for OS X, etc. PackageList:1 x 20KeyNumericKeypad