Some types of different wireless spy recorders are audio recorders, video recorders and a combination of both. Video recorders are categorized further based on where the recorder is hidden.
Audio recorders amplifies and captures sound from a distance. Portable video recorders are installed on a person in pens, key chains, spectacles and shirt buttons, whereas self recording video recorders are placed in household items such as television, compact disc players, toys and wall clocks. In addition to being standalone, video recorders come with an IP receiver that makes it possible to watch a live feed of the camera online on a computer or a smartphone.