Livescribe 2GB Echo Smartpen Record everything you write and hear so you'll never miss a word Replay your meetings or lectures simply by tapping on your notes Saves notes and audio recordings to your computer. Length = 6.18 inches Comes with Echo Desktop software for Mac or Windows (download), Starter Notebook (50 pages), 2 ink cartridges(one in the pen and one in the box) & 1 smartpen cap Mac System Requirements- Mac OS X 10.8.5 and above. Windows System Requirements-Windows 7 or Windows 8 and above. Micro USB cable for charging and data transfer