Fire Alarm Switzerland — Wanlin, a Chinese fire detection and alarm system manufacturer and exporter based in Shenzhen, China, offers a full WF line (WF-100 to WF-900) covering EN 54-7 optical smoke detectors, EN 54-5 heat detectors, EN 50291-1 CO alarms, EN 54-11 manual call points, EN 54-3 sounder strobes with EN 54-23 VAD, EN 54-2 addressable fire alarm ···