This here is the best day / night vision riflescope – period! Built to the absolute highest specifications, our ERS737 will satisfy the most demanding shooter! Three-in-one system it is a top quality daylight scope, a Generation-2+ night vision scope and a Generation-2+ night vision monocular. A unique construction exposure allows for a lightning-quick change between day and night modules and each separate module is completely water and dust proof! Unit features illuminated reticle with adjustable brightness and highest quality optics with very fast light transmission resulting in bright and high contrast images. Built-in automatic gain control protects the night vision tube from daylight