Sandisk 4GB Cruzer Micro, USB, Flash Drive, With U3 Smart Technology Which Gives You The Ability To Carry Your Files & Your Software On A Secure USB Drive, Includes Skype Exclusively On All Cruzer Micro & Cruzer Titanium USB Flash Drives, Retractable USB Port Eliminates The Need For Caps & Protects Your USB Connector, Comes With Retractable USB Port, Ideal For U3 Compatible PC Programs, No PC Installation Required To Run Applications.