Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Single factor failure

Someone else correctly pointed out the inaccessible battery compartment. He had speculated that the problem was limited to the units produced in 2004. Not sure the problem is limited. Mine was purchased in 2007 (although may have been produced in 2004??). The cover for the batter compartment cannot be opened. Had I made any greater effort than I did, I would have broken the cover. Who approves the design of stuff like this, and why is there apparently no quality check before it gets out the door. Will never know how this item might have performed since I couldn't turn it on. Lost all interest after failure to insert batteries.