Bullet Cameras

Bullets are nice in that you don't have to worry about buying a lens, like
you have to with some fixed camera models. Where bullets come up short is there
variation of focal length. Most Bullet cameras have a fixed focal length
generally at a wide angle. This can also be viewed as a benefit depending on
the circumstance.
Some models have a ring of LED's encircling the lens. This helps the bullet
camera to "see" better in low light situations.
There is also something called a pinhole bullet camera. It's used mostly in
covert security as the body of the camera is concealed behind drywall or
something and the pin hole is the only visible (or invisible hopefully)
portion exposed.