The ISM bands are defined by the ITU-T in S5.138 and S5.150 of the Radio Regulations.(see external link below). Individual countries' use of the bands designated in these sections may differ due to variations in national radio regulations.
In recent years they have also been used for license-free error-tolerant communications applications such as wireless LANs and Bluetooth:
IEEE 802.11 wireless ethernet also operates on the 2.45 Ghz band
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