Mechanical switch : The number pad features mechanical switch that ensure a fast response. The brown switch is the most rhythmic clicky feeling. The Mechanical switches are designed for longevity with greater durability and responsiveness. More than 50 million keystroke times. | Easy to use: Plug and play, USB connection, no device drivers, is an ideal choice for spreadsheet accounting and financial applications. No battery required, don't have to worry about your number pad for laptop will be no power. | The number pad is suitable for users of laptops users,banking, financial securities, business workers. It is also a great accessory for Small Laptops Without A Separate Keypad. | It has a suspension design combining the familiar with utility, and a comfortable ergonomic design that leaves most keypads behind. 4 keys (ESC, TAB, Backspace and FN) are increased to numeric section and thus more functions can be realized through the keys combination with FN. | Numeric keypad is not fully compatible with Mac system (Function keys do not work, while number keys part works fine)Numeric keypad is not fully compatible with Mac system (Function keys do not work, while number keys part works fine)

21-Key mechanical numeric keypad with Blue switches - key switch mechanism is mechanical with Excellent touch, and since they're brown switches they're pretty quiet compared to the other mechanical keys, suitable for both office use and gaming. | Cool backlight and responsive modes - you can choose from 4 different options by pressing FN+ 5. (A) constant bright mode; (b)single light mode; (C) breathing mode (D) backlit off. (E)pressing FN+ + for brightness increase and FN + enter for brightness decrease. | A stand-alone chip device that is designed for easy control and its noninterference with the main keyboard. | Hot keys available - pressing fn+esc TO turn on computing device, FN+ tab to turn on "("; FN+ backspace TO turn on ")"; FN+ Numb TO turn on "="; FN+/ TO turn on $; FN+ * to turn on and FN+ - to turn on. | Applications - (a) good for laptop users. Suitable for banking, financial securities, business workers. (B) good for laptop users. (C) used in counter register. (D) used with 87 keyboards, 82 keyboards, 68 keyboards, 61 keyboards and other keyboards without numeric section.

21-key mechanical numeric keypad with brown switches - Keyswitch mechanism is mechanical with excellent touch, and since they're brown switches they're pretty quiet compared to the other mechanical keys, suitable for both office use and gaming. | Cool backlight and responsive modes - You can choose from 4 different options by pressing FN+ 5. (A) constant bright mode; (B)single light mode; (C) Breathing mode (D) backlit off. (E)Pressing FN+ + for brightness increase and FN + ENTER for brightness decrease. | Compared to other ordinary Version keypad, 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. | Hot keys available - Pressing FN+ESC to turn on computing device, FN+ TAB to turn on "("; FN+ Backspace to turn on ")"; FN+ NUM to turn on "="; FN+ / to turn on $; FN+ * to turn on € and FN+ - to turn on ¥. | The number pad is suitable for users of laptops users,banking, financial securities, business workers. It is also a great accessory for Small Laptops Without A Separate Keypad.