A case for a recording tape cartridge is formed by joining an upper case and a lower case via mutual peripheral walls. The closer the up-link frequency in use is to the frequency band of the different radiocommunication system, the lower the maximum of transmission power is set. The second is movable with respect to the developing frame between a first position where the second guide is in continuous with the first guide and a second position where a continuous state of the second guide with the first guide is interrupted. In an image processing device such as an image encoding or decoding device for encoding or decoding an image, the processing device encodes or decodes the image in an intra-child-frame correlation system or in an inter-child-frame correlation system. If the signal transmission line is not pulled downpulled up by the other electronic device, the interface circuit exercises pull-downpull-up control.