The EOTEch XPS3 is a true performer in any lighting condition. Unlike the XPS2 series, the EOTech XPS 3 series is compatible with night vision units, but it still comes in a small and lightweight design like XPS2 models. Taking up a miniscule 2 3/4 inches or less on all mounting systems and using a single 123 lithium battery that runs for 600 hours before needing replaced, the XPS3 leaves plenty of room for an accompanying NV mount. Top of the line EOTech XPS3-4 models also feature target ranges displayed directly onto the reticule. Don't forget all XPS3 models are covered from defects by EOTech for a period of two years, and when you order direct from Webyshops free ground shipping comes included. Receive FREE Ground Shipping on all orders over $39.99.