Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Has problems.

The headphones & wireless operation work well for what I do with my iPod, which is essentially listening to Podcasts. The weak link in the chain is with the transmitter that plugs into the headphone jack of the iPod and sends the signal to the headphones. Presumably, trying to make the on/off switch on the transmitter "pretty," they have designed it as a plastic circle that you have to twist to turn on and off (turning it off so you don't have to charge it all the time), the problem is that it is hard to turn, sometimes I can't turn it off or on. A simple switch on the side would have prevented all these issues, but alas we are stuck with this poor design (in the transmitter) of what is otherwise a great, functional product.