# The Wireless Telegraphy (Exemption) Regulations 1999, Paragraph 23: Wireless Audio Applications


Wireless telegraphy apparatus designed or adapted–
(a) for Telephony, for the purpose of providing a short range radio link between the audio output of a device, so as to be capable of use on one or more frequencies within the frequency band, and at a radiated level not exceeding the maximum for such frequencies or frequency bands, for each category of apparatus, specified in the table below and subject to the following sub-paragraphs;
(b) categories i and ii are for cordless headphones or cordless loudspeakers;
(c) category iii is for cordless headphones for use in vehicles;
(d) category iv is for cordless headphones for use with personal stereo devices–
Category
Frequencies or frequency band
Radiated level
Channel bandwidth
Music or speech permitted
Duty cycle
ETSI standard
i
36.61–36.79 MHz
37.01–37.19 MHz
10 μW erp
—
Yes
—
EN 300 220–1
ii
863–865 MHz
10 mW erp
≤ 300 kHz
Yes
—
EN 301 357
iii
863–865 MHz
2 mW erp
≤ 300 kHz
Yes
—
iv
863–865 MHz
1 mW erp
≤ 300 kHz
Yes
—

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Source: https://www.legislation.gov.uk/uksi/1999/930/schedule/6/paragraph/23 (the official version)
Page: https://openlegislation.uk/wireless-telegraphy-exemption-regulations-1999/schedule-6/paragraph-23
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.