Nothing really makes it special except Yamaha designs it so you have to use their adapter.... $75.00 is crazy! There's no reason someone should pay all that money for a PSR-2000 and then have to spend an additional $75.00 to plug the damn thing in.. A lot of companies are doing this now.. They're making the devices and selling the power supply separate. Just the companies way of juicing more money out of you.......