A retaining device for photo blanks, comprising a retaining member with a supporting surface for a photo blank and a ground element which can be brought into contact with an electroconductive layer of said photo blank. The sensor has a micro-fluidic chamber comprising a rigid bottom structure, a cover, and an optical detection system that emits one or more light beams toward the cover membrane and to observe the one or more light beams reflected from the cover membrane. When a subscriber upgrades his or her mobile station the wireless carrier searches the database for previously downloaded content, identifies the equivalent content that is compatible with the new mobile station and provides the information of available equivalent downloads to the mobile station. This coating is flexible and can be applied regardless of the container’s internal pressure or lack thereof. The digital image data whose pixel number has been converted are printed in the form of a print on the rolled paper by a printer. A rotating device may be used for rotating the tubular shaft relative to the housing, with such as an interaction between a stator and a rotor.