2008 GMC Acadia Owner's Manual - Page 258

Headphones The wireless headphones have an On/Off button, channel 1/2 switch, and a volume control. Switch the headphones to Off when not in use. Push the power button to turn on the headphones. An indicator light located on the headphones comes on. If the light does not come on, the batteries might need to be replaced. Intermittent sound or static on the headphones can also be an indication of weak batteries. See "Battery Replacement" later in this section for more information. Infrared transmitters are located at the rear of the RSE overhead console. The headphones shut off automatically to save the battery power if the RSE system and RSA are shut off or if the headphones are out of range of the transmitters for more than three minutes. If you move too far forward or step out of the vehicle, the headphones lose the audio signal. The RSE includes two 2-channel wireless headphones that are dedicated to this system. Channel 1 is dedicated to the video screen, while Channel 2 is dedicated to RSA selections. These headphones are used to listen to media such as CDs, DVDs, MP3/WMAs, DVD-As, radio, any auxiliary source connected to A/V jacks, or the auxiliary input jack, if your vehicle has this feature. The headphones automatically turns off after four hours of continuous use. To adjust the volume on the headphones, use the volume control located on the right side. 3-116