The industrial, scientific, and medical (ISM) radio bands were originally reserved internationally for non-commercial use of RF electromagnetic fields for industrial, scientific and medical purposes.
The ISM bands are defined by the ITU-R in 5.138 and 5.150 of the Radio Regulations. Individual countries' use of the bands designated in these sections may differ due to variations in national radio regulations.
- 900 MHz band (33.3 cm wavelength)
- 2.4 GHz band (12.2 cm wavelength)
- 5.8 GHz band (5.2 cm wavelength)
- ITU page on definitions of ISM bands
- ITU page on Radio Regulations
- European Radiocommunications Office frequency information system
- In the US, CFR Title 47 Part 18 describes the regulation of the ISM bands.