The seller was very good, very prompt. the equipment was exelent. Simple to use (the instructions were very limited, but ok for the price). It works on any 3.5mm sterio jack socket. The batteries last for ages (you get some strange problems when the batteries are low, like the range drops and functions stop working). With good batteries the range is exelent, I would say up to 30 metres, so anywhere in the house, and in our case, the garden too! I would recomend it, and at this price, it can't be beaten. We can now listen to 6 music anywhere, by having this plugged into the DAB radio (that of course only gets good reception in one place in the house), and we can get a good signal on ANY FM radio!