It means that you can store it on a USB flash drive, save it to any computer and directly run its executable file. This is a portable tool, so installing TheAeroClock is not necessary. It can be easily customized, even by inexperienced users.
TheAeroClock is a lightweight app that places a clock directly on your desktop. TheAeroClock 8.44 Multilingual | 1.56 MB | An analog clock for your desktop to show you what the time is, providing various customization options, such as adjusting transparency and size.