system includes XLink Air and XLink Ground.
XLink Air is connected to the flight controller through a 4-pin signal cable and the XLink Ground is connected to the cell phone or tablet ("Smart Device") through Bluetooth.
The effective range between XLink Air and XLink Ground is apporoximately 1-500 meters. The transmission quality will be affected if XLink Air and XLink Groud is less than 1 meter apart. It is also suggested that the distance between Smart Device and XLink Ground should be no more than 5 meters.