multi level volume selection

multi-wavelength detection direct from Wanlin Fire Protection — 12-year factory experience, WL-SFP100 smart fire detector certified CE/EN14604/EN54/UL217/UL268/FCC/QCVN. Key specs: Dual-Wavelength Photoelectric Sensing + Infrared Scattering Chamber + 4G LTE Cat.1 Cellular Communication, 4G LTE Cat.1 + IoT Cloud Platform + SMS/Push/Email Alerts + Remote Monit···