Night Optics TG-7 Thermal Biocular is a high quality thermal optic designed for surveillance and target acquisition by law enforcement and military personnel. These thermal imaging binoculars give you crisp, clear thermal images with either "White Hot" or "Black Hot" polarity, allowing you to perform observation at night or in low visibility conditions. The 640x480 OLED display of the NightOptic TG-7 640x480 Thermal Binocular will allow you to see targets in great detail, and you can adjust both the brightness and the contrast of the image for maximum visibility. These Night Optics thermal imaging devices feature a 2x digital zoom and can be modified with an extra a-focal Germanium lens (not included) for a total 9x magnification. Night Optics has designed these bioculars to be mounted on a helmet or used independently as a pair of thermal binoculars, and these lightweight thermal optics can be powered either by an external power supply or with three CR123 batteries, both included. The TG-7 is available with 9 Hz or 30 Hz refresh rates, and includes a NTSC video port so you can save the results of your observation to a computer. Get the best in recon, search and rescue, and perimeter control bioculars when you purchase the NightOps 2x Thermal Vision Biocular.