Please note that the keyboard is free of viruses. When installing the driver, you will be prompted that a virus has been detected. Please exit the anti-virus software and reinstall the driver without this prompt. Please contact us if you have any questions. ?Expand Your Desktop? 21 keys mechanical numeric keypad is suitable for laptop users,banking, financial securities, business workers or Used with 87 keyboards, 82 keyboards, 68 keyboards, 61 keyboards and other keyboards without numeric section. ?Extreme Durability ? Ensures 50 million times keystrokes, Double-shot injection molded keycaps. high quality durable PBT keycap stand up to tough conditions. ?Ergonomic Design? The stepped keycap, fit your hands easily to prevent fatigue. Spring type ergonomic design, care for your wrist . Works with PC and desktop computers that have Windows 2000 / XP / Vista / 7 / 8 / 10, Android/Linux. ?Plug & Play? Full key support macro definition programming ,Type-C usb-a interface. it supports NumLock, ESC, Tab, Delete etc. With shortcut key which can open the computer calculator directly. The Numlock function is independent of any other keyboard that are currently connected. ?RGB Backlight and Hot-Swap Gateron Switches ? Support 14 backlight model.By simultaneously pressing the FN key and another key, you can change the backlight and brightness,Full-key support hot-swappable Gateron switch, the shaft body is stable, smooth, and comfortable, providing fast and accurate button functions.