The brace on the calf is the Bioness L300 for the dropfoot. If you want the thigh cuff you must also have the calf cuff as well. One remote controls both. When you have both the system is called Bioness L300 plus. I don't know if you can see the sensor on my shoe but when I lift my foot the sensor sends a signal to the braces to send simulation. When my foot hits the ground it goes off.