Design Go Link FM Radio Adaptor

It arrived quickly and looks good. I tried it immediately and it appeared to work. I needed a radio link for my new phone (s4) which doesn't have one. I turned the radio on and proceeded to walk to the train. I then realised that £3.50 worth of radio is what I had. It cut out consistently and could not hold a frequency from one step to the next. When I stopped it sort of worked but then the volume would drop and I would have to remove the headphones and replace them. I am not sure what I am going to use it for but listening to the radio while moving or even stationary is not going to be it.