this review title is: absolutely useless and the content is: i bought one only turned on off at low speed not variable speed as advertised returned exchanged and you guessed it the second one was also defective only on off at low speed not only that i could stop it dead by pressing lightly with one finger on the collar completely useless even on sale for half price.there are other information for this review, one is this reviewer did purchase it and the other is 0 people think this review is helpful.