DFRobot DFR0489 Manual - Page 5
Browse online or download pdf Manual for Microcontrollers DFRobot DFR0489. DFRobot DFR0489 8 pages. Iot microcontroller
Click OK
Open Tools->Board->Boards Manager, waiting automatic update. You'll find FireBeetle-ESP8266
Now, the development environment has been installed, you can use it like a normal Arduino board.