I have installed two CCD cameras in the living room.
One of them is cordless and the other is not.
They are bought in Ap Liu Street.
I use a DVD recorder to record my maid in the hard-disk for 12 hours per day.
Each of the camera will be recorded for 6 hours.
Sorry for the late reply!
For the CCTV camera, it is around $300 for non-cordless CCD camera or cordless CMOS camera.
Cordless means you don't need to have a cable connected to it and the DVD recorder.
If you want to have a wide view, you have to change the lens to a wide one.
I am now using a standalone DVD recorder (can connect to TV for program recording) to record the maid.
I have informed my maid for the CCTV camera. As the CCTV camera is as large as a Yukult bottle, she must be able to see them.