LG 55LA6600-SA.KWGYLWK User Manual page 40

✎ You can use the TV remote control to adjust the volume of the connected
device.
✎ When wirelessly connecting, attach the dongle and connect it if the model
needs the Magic Remote Control dongle. (AN-MR400, sold separately)
✎ For a wireless connection, if the device fails to connect. Check the device
power and make sure the LG Audio device is set up properly.