The design of the module include power (a solar array), docking ports, station-keeping propulsion, and internal habitation/storage areas. It would have been capable of docking with Soyuz, Dragon 2, Starliner, and Orion.
While no flighty-ready examples were build, several test articles were constructed for ground-testing. Bigelow Aerospace and ULA went as far as pennig an agreement in 2016 (updated in 2017) to launch a B 330 on an Atlas rocket; ULA later provided an update indicating a B 330 would need to launch on the upcoming Vulcan-Centaur launcher instead - due to its size.
Other projects were considered for the B 330, including XBASE (attaching a B 330 module to the International Space Station), First Base (using a B 330 on the lunar surface as a habitation), and various configurations for a Bigelow Commercial Space Station.
