I've got two of those, one put together, other for spare parts. They were $60 each, seemed like a good deal for parts to play with, considering the price tag, new...
I never opened anything up, so don't know what's inside. Have a couple of the VEX transmitter/Receivers from a surplus site, also very cheap, and did mod one receiver, so I could read the signal with a Attiny2313. Have trouble getting the chips to program, so put it on the shelf. Will try a different chip sometime, but moved on to other projects. Different transmitter from the Explorer though.