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ISM is the acronym for Industrial, Scientific and Medical. This designation covers radio frequency ranges, in which wireless radio devices may operate without license or fees for medical, industrial and/or scientific purposes.Short range technologies like ‘Bluetooth‘ or wireless LANs operate in these ranges without further requirements for specific approval by the legal national authorities in charge of tele-communications. The absence of licensing and fees simplifies the manufacture, marketing and deployment of ISM-devices. However, the assumption that the ISM bands and equipment is free from any regulations could not be more erroneous! Strict technical requirements mandate avoidance of interference with licensed devices and other wireless systems. National and international rules and regulations are binding for all ISM devices.