non polar two wire bus

US fire product market access direct from Wanlin Fire Protection — 12-year factory experience, WL-SFP300 smart fire detector certified UL 217/UL 268/UL 2034/UL 864/CE/EN14604/EN54/FCC. Key specs: Addressable Fire Alarm Control Panel + Loop Controller + 4G LTE Cat.1 + Touchscreen Display + CAN Bus, 4G LTE Cat.1 + IoT Cloud Platform + Addressable Loop (252 dev···