A carrying device most specifically for carrying a pizza box in a level position when placed on a car seat which slopes downwardly from the front edge of the car seat toward the back rest. An energy indicator value represents expected energy requirements for performing an injection of the material in a mold cavity. The sheath consists of two mutually displaceable flat sleeves, of which the lower one accommodates the microphone whose position relative to the passenger’s mouth can be adjusted in an optimum way by a mutual displacement of the two sleeves.