Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent product

This is an excellent product. I'm very impressed by it's capabilties.As some of the other reviewers have pointed out, the one minor inconvience is the battery cover. I believe the fault lies in the fact the springs in the battery cover are located on the same end, consequently one battery's negative end is postitioned against the spring, while the other battery's positive end (which is too small) is postioned against its spring.If they could move the positive terminal spring to the opposite side, it would result in much better electrical contact.If you have trouble closing the battery cover, check the positive terminal against the spring(it has a tendency to move out of position while loading batteries).Make sure both batteries are securely in position, and you can firmly close the battery cover.