window sensor alarm

smoke detector with multi sensor direct from Wanlin Fire Protection — 12-year factory experience, WL-HS100 certified CE/FCC/RoHS/REACH/ISO9001/NFPA 72. Key specs: 4G LTE + WiFi Dual Communication, Hub-Based Wireless Architecture, 4G LTE + WiFi + SMS + Push Notification + Phone Call. No monthly fees, 4G cellular backup, DIY installation, expandable to 50-100+···