The box consists of two parts: one part, the exposing box, is loaded with a Frena film pack and attaches to the camera to make the exposure; the second part is a receiving box to store the exposed films. After an exposure the exposing and receiving boxes are pushed together, this frees the draw slide in the receiving box and links the two draw slides, the two slides can then be withdrawn. A catch on the edge of the exposing box is slid from one position to the alternate position which operates the usual Frena pin arrangement to free a film and its backing card, the exposed film then drops into the receiving chamber. The draw slides are then returned.

The holder was intended for field cameras and made in quarter-plate, 5" x 4" and half-plate sizes.