Allan , just taken photos of some of the old ones I bought years ago. They work but the resolution is not the best. I do like the mirror ones as most folk dont realise there is a camera on them. Other two are narrow with drop down screens ,they attach with rubber suckers. All take SD or Micro SD cards which can be removed to upload footage. These were all bought from Aliexpress. Very, very cheap. I was looking at some newer ones last night, higher resolutions and not badly priced.