Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad quality, dropped most of my calls

The item does not work. I charged the item for two nights, then started to use it. For first few minutes, I can talk and hear, after about 5 minutes, I heard a big "alarm noise" and it continues (by this point, I can't hear and talk). So I closed the speaker and reused it after 2 days. It behavior the same, sometimes it works (the sound quality is very bad), sometimes it does not work (also it is dangours, I tried to hear the sound and it impact my driving). Also the power on/power off button is very small, you have to press the power button tightly and hold for a while, then you can turn on/turn off it, very inconvinence. I end with return the item.