I'm one that would rather for a crook to not know they are being watched. can the doorbell camera be a stand alone camera? I understand the battery charges through the door bell wiring, I also noticed what looks like a charging port on the camera. Can the battery be charged via a cell phone charger. then install the camera up in a corner of the porch or some where besides at the doorbell location?? At my shop, we use the RING doorbell cam, but have them mounted under the front porch roof. We do have to charge them periodically.