GREAT PRODUCT

I don't know if there is a difference between the RF970R, which I have, and the RF970RK, but the ones that I have work great. I can watch TV with the set on mute while my wife reads, or we can watch together and I can turn up the sound so that I can hear everything that is said. The quality of sound is good, I had no trouble hooking the headphones up, and I have even recommended them to other family members. Before I received these as a Christmas present, my wife would leave the room when I watched TV because I had the sound up too high. These headphones turn on automatically when you put them on and turn off when you remove them. They feature stereo sound which is really cool when a program or movie can be heard in stereo. Thank you, Sony, for a great product!