My friend and I both use one of these, though our cameras are not hard-wired in, we just charge them the night before we use them. So far, it’s a simple, cheap, and reliable way to watch the horses. Bonus is because they are not hard-wired, we can use the same camera as a back-up camera, and just move it to whatever you want to view.

Amazon.com : 1/8 in. Black Plastic Screw Posts/Chicago Screws (Qty 100 sets) :...
1/8 in. Black Plastic Screw Posts/Chicago Screws (Qty 100 sets) Sets snap together quickly and easily with the tap of a hammer. The post and screw on this size does not have a slot.