Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Small, light, good battery. But sometimes echo. SonyE T610

The device is really small(though LED is bright) and the battery seems to last for hours! It connects well with my T610 - I never have to sync it, even after I've sync'd the devices with other ones. The only qualm is that sometimes I hear an echo of myself when I speak. This occurs rather sporadically and I have not isolated the issue. But regardless, overall, i am very pleased with my purchase. I have had this headset for 8 months.