Doctor Who Memory Stick - TARDIS 4GB USB Key Chain with Flashing Blue LED Light TARDIS 4GB USB Memory Stick on a Key Chain with Flashing Blue LED Light - Inspired by Doctor Who Works for Your PC and MAC and is Perfect for Any Dr Who Fan! The Top Portion Doubles as a Key Chain Ring So It Can Travel With You 4 Gigabyte Memory Stick Features a Blue LED Light That Illuminates When Plugged into a USB Slot Universal Standard USB