Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Doesn't do the job

I had high hopes for this nasal dilator, but it did not perform. The magnets that are meant to hold the clip together are too weak to do the job. You'll find yourself waking up every morning wondering whether you've inhaled the device because it comes off within the first thirty minutes of sleep. The design and idea have great potential, but the final product needs to be improved.