Low-Power Transmitter definition in Computer Security terms:
Definition(s): For the purposes of determining separation between RED equipment/lines and radio frequency (RF) transmitters, low-power is that which is less than or equal to 100 m Watt (20 dBm) effective isotropic radiated power (EIRP). Examples of low-power transmitters are wireless devices for local communications that do not need a Federal Communications Commission (FCC) license, such as some IEEE 802.11X network access points, and portable (but not cellular) telephones.
Source(s): CNSSI 4009-2015 (CNSSAM TEMPEST/01-13)
reference: CSRC Glossary