The Covert looks like a ripoff of the Scoutguard SG550. I've had several different kinds, and the Scoutguard is by far the best I've tried. In my back yard I've "shot" foxes, coons, squirrels, deer, a woodchuck, neighbor's dogs, and a bobcat. I didn't know I had a bobcat!
Batteries last about a month, which is very good, and there's no lights on the camera to alert game. With other models, I kept getting shots of deer looking at the little red light. It's all infrared, so no flash to spook anything, including trespassers who will steal the camera if they know they've been photographed. Excellent movies, too.
The Chasingame site mentioned by Lone archer is excellent for comparing kinds. They like the Scoutguard, too.