SSF 136-5 is a Swedish standard for alarm receiving centres published by the Stöldskyddsföreningen (equivalent to FG in Norway). The latest version of the standard is largely harmonised with the requirements of EN 50518. SSF 136-5 requires a manned operational and technical secondary site, or alternatively, that the alarm receiving centre cooperates with another centre. Avarn Security is certified according to SSF 136-5 in Norway and Sweden. These two countries also serve as secondary sites for each other, ensuring full overlap.