A stereo which is Sirius ready has all the necessary features or functions it needs to be able to access everything that SiriusXM has to offer. You will get the full satellite radio experience along with exclusive shows, programmes, personalized stations and many other services. In some cases the SiriusXM stereo comes with a vehicle kit which includes antenna to receive the radio signal, a tuner and some other equipment. If you are purchasing only the stereo, you might have to purchase the other necessary equipment.