A Thermal Imaging Camera (colloquially known as a TIC) is a type of thermo graphic camera used in firefighting. By rendering infrared radiation as visible light, such cameras allow firefighters to see areas of heat through smoke, darkness, or heat-permeable barriers. Thermal imaging cameras are typically handheld, but may be helmet-mounted. They are constructed using heat- and water-resistant housings, and ruggedized to withstand the hazards of fire ground operations. Thermal imaging cameras pick up body heat, and they are normally used in cases where people are trapped were rescuers cannot find them.