A single or double crosshair generator. The crosshairs can be moved independently or together. The unit is controlled by a handheld keyboard with four directional arrow keys and one menu access button labeled "M". The menu button toggles back and forth between the screen menu and the function selected. Solid or dotted line selectable. Only NTSC available. #57-497 has the ability to save 8 crosshair locations to recall at a later time.