wireless upgrade

fire alarm battery backup — Wanlin Fire, Chinese smart fire alarm manufacturer and Thailand market equipment exporter by Wanlin Manufacturing Group. Thai-market line: WL-TF100 photoelectric smoke detector, WL-TF200 kitchen and corridor heat detector, WL-TF300 factory multi-sensor, WL-TF400 Class A aspirating system, WL-TF500 weatherproof call point and sound···