V (voltage), not W (wattage). Look at the power adapter specifications for the Surface Pro 4. Besides omitting the USB port, the m3 model's power adapter is unique in terms of voltage. It outputs 15V (specifically 15V, 1.6A), not 12V like the other models' adapter. I was making the observation that because we are seeing another 15V adapter again, there must also be a fanless model Surface Pro 5 using a m3 or Y-class Intel Core processor.