bob, a gentle man who seldom gets angry, had a fit. not only are they cute but they are extremely comfortable. i am scared of flying and heights. by the way, there are no excuses here for busy people because the exercises barely take 5 minutes, you can do them at home, and don't need any extra equipment. if you know for certain that you want a battery operated one over a gas powered one, then you have saved yourself a lot of time trying to narrow down just exactly what kind you want. 