I recently purchase this product about a week or so ago . I assume from the tv commercial that the Shake Weight be a motorized device . I be very disappointed at first when I find out that it be not . but when I follow the instruction , the disappointment quickly turn into joy ! I have not even have a chance to watch the instruction\/workout dvd yet , however , just follow the simple instruction and illustration , I get a very effective workout from it and already , my husband , child and I can see some definition in my arm and shoulder . I be think , wow ! if I be start to see result this quick without watch the dvd , just imagine what will happen when I pop the dvd in ... I 'll have those Angela Bassett\/Linda Hamilton arm in less than three month !