What looks like a Coby Radio is actually a hidden camera! Some models are totally convert and almost impossible to detect unless you open the battery compartment. These hidden cameras disguised as radios comes in 4 different types. The SD Card models records the video on a removable SD Card and features motion-activated recording that begins the second a motion is detected. The built in DVR models allow the user to record up to 8 continuous hours of video onto the built in DVR. The wireless models comes with a transmitter and receiver. The receiver will need to be connected to a recording device such as a DVR or VCR. The wired models have to be connected to a monitor or DVR/VCR to record of view the video.