It is hard to realise the size of these tiny devices, but if you think of a matchbox then you are going to be close and that is small for a wireless device!
These are tiny transmitters, one plugs into the Laptop, TV, music system, Mp3 or in fact any device with a 3.5 mm audio jack, the other is where the headphones or speakers are connected.
Once everything is in place then the user is able to walk around using headphones or place the speaker anywhere within the thirty feet range of the base unit.
Features of the Hammacher Schlemmer wireless speaker system:
The devices enable you to listen to TV in bed without disturbing a spouse, or to roam freely while wearing headphones without being tethered to an MP3 player or stereo. CD-quality audio is transmitted up to 30′ over the 2.4GHz band for interference-free listening. Each transmitter plugs into a USB port for charging and works for seven hours on a seven-hour charge. Includes one transmitter and one receiver, a pair of USB cables for charging, two pairs of audio cables (12″ and 24″), two neck lanyards, and two belt clips. Each transmitter 2 1/2″ L x 1 1/2″ W x 1″ D. (3 oz.)
Priced at $119.95
Source [Hammacher Schlemmer]