The first answer is No. If you want to increase your fitness, start with a good resistance training program (as cleared by your doc).
If you expect to sit on the couch with an electric thingy strapped to your waist activating your abs, it's not going to do much but feel weird. You actually have a really powerfull electric thingy installed in you from the factory--your nervous system. You can activate your core wherever you are, whenever you want. Do a plank, and squeeze your abdomen.
Once you have spent some months on a good fitness routine, you may consider using a vibrating machine. Something like that is more of a side dish, and less of a main course. They do work to increase bone density and muscle contraction.
The point is if you rely on buying gizmos, thinking they will solve your lack-of-fitness problem, they won't. Find a good program, and do it
(Certified Strength and Conditioning pro)