It looks like a TENS unit for electric stimulation, at least on her nipples, as I own one, but they come with two electrodes but noticed a wire going down to her pussy as well, not sure if there's one there too. You can see the black pouch/device to her left on the bed, and the empty white box next to her. I gotta sneak them on my old lady and try it when she's tied up and blindfolded, as she comes very hard just from rough nipple play, I do understand that the concept to a woman might be frightening though, but it's a good example of different kink devices. My woman loves nipple clamps and have started vibrating her clamped nipples as when they are clamped they are extra sensitive and she gets powerful orgasms from that.