They'll include such niceties as custom module shells. (slashgear.com)
Improved and extended the functionality of the existing custom application; designed and built multiple client facing custom modules with Apex and VisualForce. (jobhero.com)
Furthermore, as two modular smartphones, the Moto Z and Mote Z Pro are capable of working with multiple custom modules including portable projector module, JBL SoundBoost speaker module, Incipio's offGrid Power Pack module, and etc.. (gadgetsin.com)