Gulf Security Technology (海湾安全技术) manufactures addressable and conventional control and indicating equipment, sounders, manual call points, detectors and bases under the GST brand at its Qinhuangdao plant. Its range is listed in the LPCB Red Book under the 548 certificate family against EN 54-2 and EN 54-4 (548p), EN 54-3 (548e), EN 54-5 (548c), EN 54-11 (548g) and EN 54-18 (548m) — one of the broadest EN 54 approval sets held by a Chinese manufacturer. The factory additionally holds LPCB-assessed ISO 9001:2015 under certificate 548, scoped to the design and manufacture of fire detection and alarm systems and components.