Instruct: Classify the given review into positive or negative sentiment.
Query: Don't buy, Cannot be heard when using headset

Although the headset works fine for listening to the call, the microphone does not work. People always complain that they cannot hear me when I'm using this headset even if I'm shouting. The result is that I always have to take the headset off and switch to use the handset if I want the caller to be able to hear me. I'm very disappointed with this product and would return it, but it's too cheap to bother with the shipping.