Many countries are putting a spy camera in every public space possible. These cameras fill the transportation systems, street corners, and government buildings. Having a spy camera watching makes some people feel more at ease. Hidden spy cameras can be wireless or wired. Wireless hidden spy cameras come with concealed transmitters that send captured images to remote recording equipment that will contain a receiver. However, wired hidden spy cameras are connected to recording equipment, like VCRs and DVRs, through a cable. Wireless cameras rely on battery power, while the wired cameras have the advantage of a power supply. As the name suggests, hidden spy cameras are always concealed. They are usually hidden in everyday, household objects, such as clocks, calculators, radios, teddy bears, and plants. Recent breakthroughs in wireless technology now allow hidden spy cameras to transmit videos in real-time. Not only can you see the action as it unfolds, you can also take the necessary action. All you need is a PC or laptop with an Internet access to view your hidden spy cameras and the appropriate software. You can even do online surveillance. You can also set up your hidden spy cameras in such a way that they trigger alarms or send emails to you when suspicious activities are captured. Most hidden spy cameras can be set up to work unattended. They can record hours of video and can be plugged into your VCR or PC directly for review. This way, you don't miss anything and can gather proof of any misbehavior or crime.