Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Would not trust in a presentation

As a Grad student, I needed a laser pointer that would fit well with occassional powerpoint presentations. Cost was important, but apparently I did not pay enough. After about 2 weeks the laser became erratic, failing to operate at times and giving a low quality beam in others. I tried changing the batteries, but the only thing that seemed to work was holding the button down at just the right pressure. This surely is not optimal for a person who has other things to worry about during a presentation. Save time, embarrasment and your money by buying one of higher quality.