smart fire active early warning

smart fire IoT smart helmet direct from Wanlin — 12-year Chinese smart fire IoT manufacturer, WL-SFP700 certified UL 217/UL 268/UL 2034/UL 864/CE/EN14604/EN54/FCC. Key specs: ARM Cortex-A7 + 4G LTE Cat.1 + WiFi + Ethernet + Zigbee + Bluetooth + Cloud, 4G LTE Cat.1 + WiFi + Ethernet + Zigbee + Bluetooth + IoT Cloud Platform + API/SDK + MQTT/HTTPS. Complete s···