That's a personal FM transmitter, found everywhere, you connect any audio source (ipod/TouchCruise/etc) to it then you can use your fav FM radio to listen, now about TouchCruise, you may need an ExtUSB to 3.5mm jack converter to connect both.
Current: Samsung Captivate.
Former: AT&T Pure (lost)
Former: O2 XDA Orbit 2 (stolen)
Former: Cingular 3125 with Erofich WM6.1 Std. (dead)
Former: MPX220 with WM2003SE (dead)
"Use what talents you possess; the woods would be very silent if no birds sang except those that sang best."