Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good for the first 4 months...

I don't know if the life span of this device is under 6 months... I bought it and worked ok for the first 4 months... then suddenly the headset stop charging its internal battery... So it becomes useless.I don't live in the US, so it was cheaper to throw the headset to the trash and buy a new one (no more plantronics for me).