so , I think this shake on it be own -lrb- well , with the help of battery -rrb- but it do not . I read the review and see other people who say the same thing but I think , maybe they just do not figure out how to turn it on . I be wrong . obviously we be not the only people to think it shake on it be own because the people of Shake Weight have they own website explain how to make it shake ... call ` howtoshakeit.com ' so , if you do not believe I -lrb- or think I just do not know how to turn it on -rrb- go to that website . it seem like the weight and the shake part of it probably do help with you muscle and everything but it also seem like , if you hold a regular weight very loosely -lrb- allow it to slide between you hand -rrb- and shake it like you would the shake weight , that probably work about as well . they suggest you do it for 6 minute a day -lrb- which sound easy -rrb- but for beginner , that be nearly impossible , as the weight really do work you muscle . if you buy the weight new , it come with a short video with a 6 minute workout and if you watch it , you see that the lady who do the video do not even seem like she can do the whole 6 minute straight , as the lesson do not seem to be one continuous shot but clip paste together to make a complete 6 minute video -lrb- if that make sense -rrb- . if you have get the money to spend for a ` special ' dumbbell , then go ahead and buy this . but if you be think it be go to be some kind of miracle worker , I do not think it be . I highly recommend you try shake a regular dumbbell first and see if that help you muscle because , like I say , that be basically what this do . I be a little disappointed .