Convenient, plug and play equipment, easy to install.USB Connect | High quality with silent and comfort feeling.Integrated ergonomic tilt provides added comfort which helps reduce strain, great for those working on spreadsheets, accounting files or financial application. | Slip and fall proof, not easy to wear, button design, feel comfortable. | Numeric Keyboard can be arbitrarily mobile, key voice is light, the input data is very easy. | Numeric Keypad suitable for a variety of notebook computers, desktop computers etc.