1. When the headphones are powered on, you can hear yourself speak into the
     mic, which is a good way to test if the headphones have shut down to save
     battery power.
2. Although the headphones will continue to operate even on low battery power,
     the performance will degrade as the batteries begin to drop in voltage.
     Be sure to change the batteries if you sense that the headphones are less
     sensitive than usual, or the sound is distorting, regardless of volume 
     settings.
3. The headphones work best when powered with 1.5V alkaline batteries.
     Rechargeable batteries rated at 1.5V will give a longer period of playing
     time than those only rated at 1.2V.
4. If you stand too close to the transmitter, the IR signal may overload
     the headphones and the sound will be automatically muted. For best
     performance, stand between 2' and 20' from the transmitter.
5. If you hear hiss, turn down the headphone volume and turn up the 
     transmitter input level.
6. If you hear distortion, turn down the transmitter input level, then adjust
     the headphone volume.
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