Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Satechi Bluetooth FM Transmitter for iPhone.

I use this with my iPhone 3Gs. Easy to use and set up. The only problem I have is that the microphone is in the lighter plug and sometimes my voice is not clear to those receiving my calls. It seemsusing the microphone on the phone would be better.It may be able to do this, and I have not figured it out, but an off switch with the unit would be nice, rather than having to pull it out of the accessory plug.I had a question, and Customer Service at Satechi was excellent.