If you need to conceal your video surveillance device, there is a huge range of devices available, some of them so small that they can fit inside a single screw.
These items have a pinhole lens that is no bigger than several millimeters in diameter, and a resolution of over 300 lines. But bear in mind that smaller is not always better and it will almost always make things more expensive. A creative plant is much more important to your snooping success.
Concealed cameras can be fixed inside your home, such as in a clock or fire alarm for example, or they can be portable, such as in a boom box radio. Coupled with motion detection, they can be a potent part of your spy arsenal.
The concealed clock-radio camera, for instance, can be set to begin recording a few seconds after motion is detected, then switch off if there is no longer any motion. They can even be worn on your body, in a baseball cap or in a pair of sunglasses for example, recording everything you look at. Hidden cameras that are wireless typically transmit their video and audio back to a receiver that is up to 100 feet away.
Depending on the type of camera you use, you will be able to connect it to either your TV/VCR, camcorder, or computer for recording options. Some digital cameras can have built in digital video recording (DVR) capability, so that your footage can be easily transferred and stored to your computer.