https://www.saj-electric.com/.
2.
USB interface could be externally connected with eSolar 4G module, for
operation in details please refer to eSolar 4G module Quick Installation Guide in
https://www.saj-electric.com/.
3.
USB interface could be externally connected with eSolar WiFi module, for
operation in details please refer to eSolar WiFi module Quick Installation Guide in
https://www.saj-electric.com/.