signal extension

scripture hall fire detection — Wanlin Fire, Chinese heritage building fire protection manufacturer and exporter by Wanlin Manufacturing Group. Non-invasive wireless fire detection line: WL-HF100 photoelectric smoke detector, WL-HF200 incense-hall heat detector, WL-HF300 multi-sensor, WL-HF400 Class A aspirating system, WL-HF500 EN 54-11 call point and sound···