WIRLESS/WIRED PINHOLE CAMERAS
A good stand alone wired pinhole camera can record up to four hour non stop of HDD video footage stamp with Date and Time before running out of power and storage space.
We have seen it built into clocks, flower pots, pen, posters smoke detector, radio, soft toys. The problem is these cameras are getting more difficult to detect with naked eye. If fact, it can extend the recording time from the pinhole camera to an external hard disc drive recorded up to 1 TB.
The truth is not all these cameras can be seen by untrained eye because many are wireless in the most case you need to fish these cameras out, and they are becoming cheaper too.
A wired Pinhole camera come with a fixed lens for taking video footage not more then a room size, and cannot operate under total darkness as they do not have a build in infrared. As for the wireless pinhole camera, usually it transmits not more then 150 meter form the transmitter to the receiver.