Type: numeric keypad 1. 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 gaming 2.A stand-alone chip device that is designed for easy control and its noninterference with the main keyboard 3.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 section Product details: Switch: Blue Actuation Force: 50 +/- 15CN Rating: 5V, 300mA Keys:21 keys Data Cable Length: 150cm Product Weight: 416g colour:White Material:plastic size:Approximately 12.3 x 8.2 x 4.2cm Package Contents: 2 x Numeric keypad Only the above package content, other products are not included. Note: Light reflection 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.