Above the cab there is sleeping space for a child or adult at the drop-down overhead bunk. Along the curbside you will find a 68" jack-knife sofa with two seat belts. Across the room there is a slide out 68" Dream Dinette with cup holders, seatbelts, a 40" LED TV, a two burner range, and an overhead microwave. Along the interior wall you will find a sink, a flip-up counter top, and an overhead cabinet. To the left of the door you will find a broom closet, refrigerator, and a closet for your hang up clothes.
The above is from a description by General RV of the new Vegas 27.7 model. But everyone should know by now that the 2018 line has the microwave under the stovetop, where a traditional gas oven used to be found.
My point being that just because a retailer's description says the 660 features voice activation doesn't mean it's really there.
Here's the link to Garmin's webpage.. I can't find anything that mentions voice.