A USB Bluetooth transmitter is a beautiful thing to have when you need a simple, quick, affordable way to transmit data and sound at distances of 100m/300'.  Simply put, Bluetooth is a Radio Frequency, or RF, transmitter.  RF has the distinct advantage of being able to pass through walls and objects, unlike IR or infrared signals (what wireless remotes use).  We use them in our line of car PC's for things like listening to DVD's with wireless headphones, answering cell phone calls, wireless OBDII transmitters, and more.  Use them anywhere you need wireless transmission that is limited to 100m/300'.  Our Bluetooth transmitters are both V1.1 and V1.2 compliant.  They are also Vista compliant.