Spy gear is equipment used for the surveillance of others, in order to secretly gather information. Spy gear can be as simple as a pair of binoculars and a camera, or as sophisticated as Global Positioning System tracking devices, or infrared night vision equipment used for surveillance in low light. Most spy tools involve a certain amount of specialized technology, making them somewhat costly, especially for those who will not be using the equipment repeatedly. This is often why those who want to collect information may decide to hire a private investigator, who will likely have a good stock of spy equipment.