Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sennheiser RS120 wireless headphones

Technically, item is as described. Like the concept but do not like choice of materials. I realize lightweight is a design goal but the lack of reinforcement in the plastic headband is a dealbreaker for someone with a larger head. After 2nd or 3rd use the headband is sprung and falls off. Would not buy again.