In a method for controlling pricing of a product, a radio frequency identification tag having at least one processor is attached to a monitored product. A setting device for setting a force of contact pressure to be adjusted between the clutch components depending on the weight of the piece goods, is arranged between the conveying roller and the first clutch component. The sealing device comprises a body of an insulating material molded in situ about the electrical joint to completely cover it and bond to portions of the electrically insulating covering contiguous with the joint to thereby insulate the joint and prevent the ingress of water or other materials into the joint.