I am thinking of buying SEAT ALTE 1.4TSI Style + Family Pack (roof-mounted 7'' TFT screen with RCA connection, along with additional roof storage boxes, a storage box under the parcel shelf and a forward sliding rear seat.), and I have couple of questions about this pack... 1. what is RCA connection on TFT? 2. Does TFT has its own speakers? 3. Is it possible to use car's rear speakers for TFT and front for radio? 4. are rear seat sliding all together or is it possible to slide separately?