Rear Seat Entertainment System (RSE), Generation 3.1/3.2 (75TH Anniversary Edition; 2002): Function: Headphones
Two sets of IR headphones are included. Any number of headphones can be used provided they are within the area of the IR transmitter. The wireless headphones use an infrared signal. There must be a free path between the transmitter and the receivers on the side of the headphones. If the path is blocked, audio will be interrupted. The headphones are activated by pressing the power button on one side of the headphones. They switch off automatically 3-4 minutes after the IR transmitter has stopped sending a signal.
Lowering the volume of the screen will increase the signal/noise ratio of the headphones. Optimal headphone output is obtained by setting screen volume to 75%. Headphone volume can then be regulated using the wheel on the headphones themselves.