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.