http://www.aliexpress.com/item/JANOEL-DIGITAL-MiNi-25-QUAIL-EGGS-AUTOMATIC-INCUBATOR-WITH-AUTO-EGG-TURNER-New/538719985.html
this is the one I have. I'm using it at the moment, have already successfully hatched all eggs. I have the 9 chicken egg one, it's really awesome!
Looking again, I'd confidently say, keep brown/red one (with naked neck) away from hens for 2 days and see if the eggs have dots then. I watch my cockerel a lot, his mannerisms/face shape, they have a certain look...pretty sure he's the smooth move
First photos of brown naked neck one at top looks cockerel-ish to me. What breed is that? Why has it got no neck feathers?
Red flush comb, fleshy comb and wattles, tall upright chest, narrow back...mischievous look in his eyes...