Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great purchase

We bought these for our 11 month old son to use at Talladega for the Nascar race in April. They worked great! We were really close to the track so we were still concerened that he would still be able to hear the noise with as loud as it is when the cars go by, but no problem. He actually still slept through most of the race, so they worked great.