Litop 16GB Black Metal Pen Style USB 2.0 Flash Drive Memory Disk With A Ballpoint Pen Inside The pen design USB flash drive inside with a ballpoint pen, its ballpoint pen is replaceable Easy to use, just plug in and play directly, no need any extra power supply Operating system supports windows 7 /8, Vista/XP/2000/ME/98/910, Mac OS 8.6 above and Linux, etc.; 100% of quality guarantee Small and pocket-sized for easy transportability with high speed in writing /reading transfer