Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Electronic listening device

This is a pretty cool device. You can hear really well with it turned all the way up. You can hear about 200 feet away really well, after that I guess you can hear okay but not as clear as 200 feet away. Birds sound so beautiful with this, but if a dog barks while using it, look out, that hurts your ears! It picks up even your neighbors talking outside. Very cool for kids pretending to be policemen, or just listening to animals in the wild. Fun and easy to use. Requires one 9 volt battery.