residential smoke detector

4G wireless fire detection system direct from Wanlin Fire Protection — 12-year factory experience, WL-HD900 4G smart fire protection product certified CE/FCC/RoHS/REACH/ISO9001. Key specs: 4G LTE + Thermistor Fixed Temperature & Rate-of-Rise, 4G LTE + SMS + Push + Phone Call + App Alert. No monthly fees, 4G cellular backup, cloud platform, DIY installation. ···