Media could not be loaded. Got my ShoulderSphere I tried it yesterday. I like it. Doesn't hurt me when I use it. I have a torn rotor cuff. It seems to work. The battery cover was my only problem. Inventor Wing Chang He called me to tell me about Piece of Pie When he explained it then I got it. You have to put in your left hand the white buttons on top and 2 levers with 2 fingers reaching towards you, it clicks and opens.