i wasnt for sure if i was gonna like this product when i first tried it..it took a minute for me to figure out even though it seemed simple ..i read directions did what directions said ..when you twist the cup part onto the bottom to blend..theres 2 arrows that gonna line up or else the light will flash and it will not start up..my arrows were lined up it 
kept flashing and would not start..i went to give up and unplugged it from the wall when i did i decide to hit the power button again and when i did it started blending and it blend so well..i made a peanut butter banana smoothie ..i love that you can just twist it off and carry it with you..