Oh, yeah, I forgot about the camera to get ID for the police.
Otherwise, I only paid $20 for the doorbell and another $20 for the motion detector. All I had to do for setup was pick 1 of 50 different tunes and then pair the doorbell to the motion detector by first turning one on and then the other within 10 seconds while triggering the motion detector. I did the same thing with the door button which I put on the back door (I already have a regular doorbell on the front door, we just can't hear it upstairs). I
think I could pair the door button and motion detector to the doorbell with different tunes to make it obvious which is being triggered, but I didn't bother to do that.
Then a volume button on the doorbell sets 1 of 4 volume levels, and they're plenty loud in my house. Couldn't be much easier or cheaper, except for having to read really tiny print on the instructions.
But I suppose det cord is nice too!