Summary: I'm very sensitive on touch feeling and for the purpose, this item is not so good. Arrow keys are small and difficult to type up/down keys. The most inconvenient part is small number keys and array ( I think the number array should be exactly same as computer keypad array.
Still better than hauling a full-sized USB keyboard around
Rachel M Donahue, Amazon
8 January 2015
Summary: I bought this to use with a Bitlocker-encrypted Windows 8 tablet (the second numpad I've tried)--I thought the trackball and arrow keys would be handy additions. This *does* work for that purpose, but to make it work on a cold boot you have to first hit the Windows key to "view additional recovery...
Summary: LOVE this thing, originally got it to control android phone in car, now find that it's a great alternative solution to my sticky touchpad on a hot summer day. Perfect add-on includes; scroll wheel, trackball, right and left click buttons, UP/DOWN/RIGHT/LEFT keys for easy navigation of excel...
Summary: I bought this as a two-in-one to give me an alternative to the trackpad and add a number pad to my laptop while doing class work. This device works well both on its own, as a trackball, and as a num pad. The device is plug&play and works out of the box with both Linux and Windows.