star topology

Heat Mapping - Wanlin, a Chinese manufacturer and export supplier based in Shenzhen, China, builds Hong Kong wireless fire alarm and fire detection systems: LoRaWAN and RF 433 MHz wireless gateways with 4G or Wi-Fi uplink, battery-powered wireless call points and smoke and heat detectors, mains-powered alarm units with 2-hour UPS backup, IP67 enclosures and ···

10 year battery smoke detector direct from Wanlin Fire Protection — 12-year factory experience, WL-GA200 4G smart fire protection product certified CE/FCC/RoHS/REACH/ISO9001. Key specs: 4G LTE + Semiconductor Gas Sensor (NG/LPG Dual), 4G LTE + SMS + Push + Phone Call + App + Solenoid Valve Control. No monthly fees, 4G cellular backup, cloud platform, DIY in···