I don't know that particular model but there are not many similar cameras for less than £100. Lidl sometimes have one on offer for a little less than the one you have linked to but I don't think there any offers at present. The one we used is a different make but the principle is the same. They use a passive infrared sensors (PIR) to detect a change in the infrared radiation in their field of view and when that happens the camera is switched on.
The following refers to the one camera I've used, others may be different
The good points -
works, picked up mice, birds, foxes, pine martens and badgers on ours,
small and easily located, though see the bad points below,
sensitive enough to detect mice and, as it is looking at heat changes, not affected by leaves and branches moving.
The bad points
ordinary NiMH batteries need recharging about every two or three days,
the sensor's detection field seems very much a horizontal band so animals above or below where the camera is pointed may be missed,
at night the red lights that illuminate the scene can bleach out an animal if it is very close the camera.
the strap to attach it to a tree/post is often not that useful - doesn't always point in the right direction so we found an old tripod is more useful.
You are not going to get any prizes for the quality of the videos but they are easily good enough to identify individual animals and it is interesting to see what is about. Here is a short video from our camera.
Dave
