US Patent 10209033 Light sighting and training device

A sighting/training device configured to be mounted to a pistol handle of a gun incorporates a light source, a power source, and a control. The device has at least two operating modes and a switch to select one of the modes. In a first operating mode the light source emits light when a button grip is pressed by a user, and does not emit light when the button grip is not depressed. In a second mode the light source emits light when a sound, such as the sound of a gun firing pin, is detected.