2010 Infiniti FX50 Owner's Manual - Page 260

● the headphones maybe out of the range of the transmitter installed in the rear flip-down display screen. This is not a malfunction, or ● the sound may be interrupted temporarily when there is an obstacle between the headphones and the transmitter. Remove the obstacle, such as opaque materials, hands, hair, etc. SAA0720 SAA0721 Headphones Headphones are a wireless type and no cables are necessary. You can use them in almost all the ranges in the rear seat for listening to the sound from DVD or AUX. (It is not possible to use the headphones in the front seat.) Power ON/OFF : Push the POWER button to turn the headphones on or off. Volume control : Turn the volume control knob to adjust the volume. The headphones will automatically be turned off in approximately 5 minutes if there is no sound during that period (when the headphones cannot receive infrared rays). To prevent the battery from being discharged, keep the power turned off when not in use. If the sound from the headphones is not clear it may be because: ● of an infrared communication device or cellular phone, turn down the headphone volume or stop using the headphones, or 4-94 Monitor, climate, audio, phone and voice recognition systems