It's an iPod-specific audio transmitter/receiver combination, working through Bluetooth technology.
The transmitter plugs into the iPod headphone jack, while the receiver connects to your stereo and with RCA plugs as well as optical and headphone output, therefore it can integrate into any stereo configuration.
It works with any dockable iPod: 3G, 4G, iPod mini, and iPod photo.
Maximum distance: 30 feet, no need to keep the transmitter in the receiver's line of sight.
Price: US$ 149.95
Check Griffin FAQ too.
At last, no FM radio or cables around?