Instruct: Classify Amazon reviews into positive or negative sentiment
Query: these slid off my ears - no way to adjust the neckband

These would have to fit just right around the back of the head to the ears in order to work. The arc of the neckband was too wide so the earpieces kept sliding off my ears from not having enough tension to hold them in place. Since there is no way to make fitting adjustments (cannot bend or re-shape the band), I had to return them.The sound quality was fine and I did not get to test the microphone. This review is just for the problem of fit and no available way to adjust the neckband.