wanlin nb iot cellular smoke detector

China NB-IoT Cellular Smoke Detector manufacturer and export supplier for Sri Lanka market. Wanlin Fire Protection provides CE/EN54/UL certified smart smoke, CO, and gas detectors with 4G/NB-IoT/LoRa connectivity. Factory direct pricing, OEM/ODM customization, global DDP shipping. Inquire: wanlinfirecontrol@163.com