This is mini compact ultra slim USB wired 78 key multimedia keyboard, press " fn" key then an arrow,home,end,page up,page down cominations for shortcuts."fn" key blue key for multimedia composite key.For activating or deactivating Number Lock, press FN and NumLk (For the keys which are printed in Blue, e.g.U, I, O) It's very narrow and lets you keep your mouse close and minimized the distance to reach out to the mouse.System support : Windows XP Windows Vista Windows 7 Windows 8 Windows 10 Mac Linux Android Size: 28.5cm x 12cm (11.2 x 4.7 inch)(LxW) USB Cable: 1.5M /4.9ft Wired: USB 2.0 connection Package included: 1 x USB Multimedia Mini Keyboard