Sony RM-X7BT Operating Instructions - Page 16

 Check that the battery of remote commander becomes full.  If you use an iPhone, update iOS to the latest version. NFC function One touch connection (NFC) is not possible.  If the smartphone does not respond to the touching.  Check that the NFC function of the smartphone is turned on.  Move the N-Mark part of the smartphone closer to the NMark part on this remote commander.  If the smartphone is in a case, remove it.  NFC receiving sensitivity depends on the device. If One touch connection with the smartphone fails several times, make BLUETOOTH connection manually. BLUETOOTH function The connecting device cannot detect this adaptor.  Before the pairing is made, set this adaptor to pairing standby mode.  While connected to a BLUETOOTH device, this adaptor cannot be detected from another device.  Disconnect the current connection and search for this adaptor from another device. No ringtone.  Depending on the connecting device, the ringtone may not be sent properly. The sound skips during playback of a BLUETOOTH audio device.  Reduce the distance between the adaptor and the BLUETOOTH audio device.  If the BLUETOOTH audio device is stored in a case which interrupts the signal, remove the audio device from the case during use.  Several BLUETOOTH devices or other devices which emit radio waves are in use nearby.  Turn off the other devices.  Increase the distance from the other devices.  The playback sound stops momentarily when the connection between this adaptor and the smartphone is being made. This is not a malfunction. 16GB