That is an excellent find! Not a bad price either
It looks like it could also handle a couple of other duties like turning lights on and off depending on the track...and the SD card is a big pro to load it up with sounds and scripts
The only thing I didn't see on teh site was any dimensions of the device...but extrapolating some info based on the SD card size (typical SD cards are about 1" wide by 1.25" long)..it looks like the player would be roughly 3.25" along the SD slot side by 3.25" along the bottom edge where the name is. Not bad for some of the larger scale ships
I'd have to do a bit of waterproofing but all in all not a big deal. Power would be the biggest thing and it would be easy enough to rig a separate battery just to power the sound.
I might have to add this to my "wish list" to get one day...I was thinking about putting some sounds on my Crockett and this might just fit the bill perfectly!