I have been considering buying a cheap night vision device. I've noticed most of them are monocles. I know absolutely NOTHING about them, except for what little I have read in forums such as this. I would just like to have one for fun sake. When I sleep with the windows open in the summer and hear twigs snapping, it'd be neat to see what critter is making the noises. It would also be a nice security measure to have to see if anyone is sneaking around at night. Although, thats not really a big concern where I live. Does anyone have something like this? Are there any good devices out there within a $150 range or less? I would prefer one with typical battery sizes so that rechargeable batteries could be utilized. For those of you that have one, how often do you use it? Do you consider is a worthwhile investment?