Flexitron, Modem, models:

MTX-2G-T	Hardware User'S Manual
MTX-4G-JAVA-IoT	Quick Start Manual
Mtx MTX-STARENERGY-M	User Manual
Webdyn MTX-StarEnergy Driver ETH-USB	Manual
WebdynEasy LoRaWAN	User Manual
webdyn MTX-StarSensor	Hardware User'S Manual