RGB Backlight And Blue SwitchSupport 9 Backlight Modes. By Pressing The Fn Key And Numpad 5 At The Same Time, You Can Change The Backlight, Professional Mechanical Black Switches, With A Tactile And Crisp Click, Provide Fast And Accurate Button Function. 21 Keys Mechanical Numeric KeypadMagicfore Qisan 21 Keys Enhanced Mechanical Numberic Keypad Has 17 Numeric Keys And 4 Additional Keys,Including "Tab""Esc"""And "Fn". By Simultaneously Pressing The Fn Key And Another Key, You Can Input Parentheses, An Equal Sign, Currency Symbols, Or Activate The Calculator.