Type: numeric keypad1. cherry 21-key mechanical numeric keypad with brown switches, they're pretty quiet compared to the other mechanical keys, suitable for both office use and gaming2.A stand-alone chip device that is designed for easy control and its noninterference with the main keyboard3.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 x to turn on euro and FN - to turn on""4.Applications - Good for laptop users. Suitable for banking, financial securities and othe business workers. Can used with 87 keyboards, 82 keyboards, 68 keyboards, 61 keyboards and other keyboards without numeric sectionProduct details:Switch: BlueActuation Force: 50 +/- 15CNRating: 5V, 300mAKeys:21 keysData Cable Length: 150cmProduct Weight: 208gcolour:WhiteMaterial:plasticsize:Approximately 12.3 x 8.2 x 4.2cmPackage Contents:1 x Numeric keypadOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.