Instruct: Classify a review into positive or negative sentiment.
Query: Great product!

I have a home office call center and spend 8hrs a day on the phone. This product has been fabulous for me! It applifies more than needed at the high setting and the tone adjustment lets you tailor the sound to eliminate any hiss. It even came with the 9v battery needed, included! Highly recommended for anyone tired of asking people to repeat things all the time. My only knock against it was the connection cord to the phone was only 6 inches long, leaving little options for placement on my desk.