About the X2 Headphones:
  Ear Force X2 wireless headphones use infrared (IR) technology to transmit
  sound from the base unit to the headphones. The IR light beam is received 
  by sensors in each earpiece, so the headphones must be within sight of the 
  base unit in order to operate properly.

  The X2 is perfect for listening to game audio on an Xbox or other game
  console and may also be used as a high-fidelity wireless headphone for 
  home theater sound, PC audio, MP3 players, etc. 

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Important Information:
  1. Be careful when turning on the master volume control on the headphones. 
     Before placing the headphones over your ears, set the volume control to 
     minimum, then slowly increase until you reach a comfortable level.

  2. CAUTION: Use only the supplied power adapter. Failure to use the correct 
     power adapter can result in fire and permanent damage to the base 
     transmitter unit.

  3. Like any speakers, overdriving headphones may cause damage to both the
     headphones and your ears. Please listen at moderate levels.

  4. WARNING: Long term exposure to loud music or other sounds in headphones 
     may cause hearing damage. It is best to avoid extreme volume levels when
     using headphones, especially for extended periods. Over time, your ears 
     adapt to the volume level, so a level that may not cause initial 
     discomfort might still damage your hearing.

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