If I buy without rear camera, is the camera same meaning in picture screen looks smaller or missing, Can you confirm if camera screen size same, smaller or non existent.

1. Do you provide installation service or recommend any place. 2. What’s the voltage / amps it need to work also does it have back up battery 3. What’s sort of GPS data it saves.

Is the power cable included with camera?

It includes front and back(rear) cam?