The PAX S920 and PAX A920 are advanced payment terminals within the PAX lineup, each tailored for specific functionalities. Although both are mobile terminals, they operate on different operating systems: the PAX S920 runs on the Linux-based Prolin OS, whereas the PAX A920 operates on Android. Additionally, the PAX A920 features a larger screen and both rear and front-facing cameras, whereas the S920 is camera-less. Both models include high-speed printers and lithium-ion batteries as standard features.