This case protects the transmitter box used for diaphramatic pacers. Equipment made by Avery to help children with CCHC. This one's "engraved" with my nephew's name. Surprisingly, for much portable medical equipment, protection is an afterthought. The transmitter box is customarily simply carried in a backpack. This case was actually created with the primary goal of protecting the device and keeping its knobs and switches static within the backpack!