Fiio R7 Manual page 52

4.FiiO Link Wifi control
There are mainly 3 steps.
1.Make sure the R7 and your mobile phone are connected to the same WiFi
network.
2.On the FiiO Music app of the R7, Settings->FiiO Link->┆ (on the upper right
corner of the display), choosing WiFi as the Server. Now an IP address will
show up.
3. On the FiiO Music app of the mobile phone, Settings->FiiO Link->┆ (on the
upper right corner of the display), choosing WiFi as the Client. Input the IP
address in the pop-up dialog and complete the connection.
Notes: iPhones only support FiiO Link WiFi control but not Bluetooth.