The MSS Module is a mid-sized, double-ended module used for space station building. This module is first seen when visiting the MSS.
It's a large module, with size comparable with the Large Station Module, Airlock, and the Refuel Silo. Because of that, you need to use an large and powerful rocket, like the Saturn V, N1-LOK-LK or the SLS.
It uses 15 power when its power is switched on, and can store 8 cargo.