Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Totally useless

Wish I had found these reviews before purchasing this product. This will NOT jump start a dead car battery.Is there product that does what this promises i.e., jump start a dead car battery without 1)another car and 2)going under the hood?Please let me know as I've wasted too much time, money and safety on products that don't work (including this one).