content: It cuts off High frequency range almost completely. I had iRiver FM transmitter for a couple of years until it broke, so i tried this Monster and must say that the transmitting signal is a lot stronger than iRiver and the bass is nice, but ALL, not kidding - all of the treble is gone! the sound is flat! I thought i can live with it at first but then it's so annoying - it is going back where I bought it. And I am placing an order for the iRiver Transmitter. Whoof.