I went to Walmart to pick up the Jensen that was on close out,Or so I thought. The display unit was the jensen9311ts. What they give you is the Dual 8181. They look very similar and with the mind set I was buying the Jensen I didn't notice. I could take it back however they do not have any of the Jensens left so I would have to just get a refund. Does anyone know the difference between the two? Thanks