content: This thing is built well and worked great. I've had other FM modulators that connected via the headphone output but they could only select 4 fm stations and didnt work that great. I was impressed with this unit. It has a digital tuner selection where you can choose any frequency you want (200 channels i believe) that gives a strong signal. Also it uses the nano dock connecter which outputs line level rather than headphone so you get a clean sound output. Highly recommended if you dont want to mess with cables and such.