This is a Bluetooth low energy (BLE) application for ELTRES EL-520(P) configuration. By synchronizing with your EL-520(P), you can check the FW/APP versions and current settings. Also, you can adjust device setting to fulfill different scenarios. With this application and EL-520(P) we believe you will have a better IoT experience. Functions: β’ Basic Information β’ FW version / APP version β’ Device settings : Transmission and GPS acquisition durations β’ Firmware upgrade