They have an on/off switch and connect to a sound source with an audio cable, not USB. The audio cable has 2 rca plugs. There are 2 adapter supplied. One adapter is 2 rca female plugs to 1 eighth mini plug. And the other adapter is a quarter inch male to a female eighth mini jack.

earlier, Peter Scanlon, wrote:
Do these have a physical on/off switch so one can know if they are on or
off?
Do they connect via USB?


  ----- Original Message -----
  From: john schwery
  To: PC Audio Discussion List
  Sent: Friday, February 03, 2012 3:21 AM
  Subject: Re: please recommend good wireless headphones


  I like the Sennheiser rs120 wireless
  headphones.  I can even take them outside and
  still get a good signal.  K-Mart has them for
  around $70.  You may have to order them online as
  the local stores may not have them.

  earlier, joanne, wrote:
  >I would like to walk or sit at a distance from
  >my laptop sometimes, and as my earphones are
  >short I can't do this.  Does anyone have
  >recommendations for a top-quality brand or model
  >of either wireless headphones or headphones that
  >have perhaps a longer cord than normal?  Thanks.
  >
  >Joanne
  >To unsubscribe from this list, send a blank email to:
  >pc-audio-unsubscr...@pc-audio.org

  John
  Currently in Ocala, Florida Partly Cloudy, 71°F Wind:N-360° at 5mph
  Whatever you do may seem insignificant, but it is
  most important that you do it.
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John
Currently in Ocala, Florida Partly Cloudy, 75°F Wind:Calm
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