Of course you have the WIFI cameras too. I have one but be darned if I can get it to work and they have very limited range but the adjustability is big plus.
Another cool little item that comes in handy for security, Auto and plumbing/housework are wired snake camera via USB.
I just got one that works great, has a 15ft lead and its own led light. Under 3/8 dia so you can do about anything with it. Plus going right to your laptop (have to try it on my phone still) you have great viewing and record options. I am sure there are better ones, but for $20 how can you go wrong?