# The Wireless Telegraphy Apparatus (Low Power Devices) (Exemption) Regulations 1991, Paragraph 4: Lone Worker Safety Alarm


Wireless telegraphy apparatus designed or adapted–
(a) for the transmission of non-verbal signals to wireless telegraphy receiving apparatus summoning assistance for workers at isolated locations or working in hazardous environments; and
(b) so as to be capable of use only–
(i) at a power not exceeding 10 mW ERP on the 173.1875 MHz frequency; or
(ii) at a power not exceeding 100 mW ERP on the 458.8375 MHz frequency.

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Source: https://www.legislation.gov.uk/uksi/1991/1523/schedule/paragraph/4 (the official version)
Page: https://openlegislation.uk/wireless-telegraphy-apparatus-low-power-devices-exemption-regulations-1991/schedule/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.