A hearing aid comprising a lid, an electronics module, and a microphone adapter, wherein the electronics module and the microphone adapter provides a groove for sliding engagement with a pivot of the lid, the groove extending partially over the electronics module and partially over the adapter between a position where the lid is closed and a position where the lid is partially open. The belt tightening drive engages an anchoring point of the seat belt fastened to the vehicle seat. The first set of MIMO communication resources may be allocated for communicating the first portion of the unit of information. An interface between the housing and the hub provides a journal bearing interface to improve axial stability between the hub and housing. In one embodiment the subject invention provides a discharge means for a reservoir housing containing irrigation solution wherein the discharge means has one or more specifically designed nozzles through which a sufficient volume of the irrigation solution can pass at an appropriate pressure.