Oh, so it's a picture puzzle! Well, the top deck looks like a really crappy job of molding, which suggests it's a prototype. The doohickey seems to have a waterproof access port of some sort and possibly some user input points that are partially obscured by the tether. The center "window" resembles a graphical user interface, perhaps a small LCD screen? Could it all be about Piezoelectrics?  I mean, why not? After all, they've been tried in everything else, from snow skis to pool cue shafts, so water skis certainly can't be immune... TW