NANO 2S Interconnected Portable Gas Detector and Alarm simultaneously monitors hydrogen sulfide (H₂S) and combustible gases, enabling long-distance transmission of alarm signals. This device provides real-time alerts to all workers in hazardous conditions and features fall detection and an SOS call function. It also supports GPRS communication, a 470MHz warning network, USB data transfer, Bluetooth 4.0, as well as both GPS and BeiDou positioning systems.