Sightmark SM18008 Photon XT 4.6x42S Digital Night Vision Riflescope N/A Imported The extremely versatile Sightmark Photon XT 4.6x42 delivers a higher magnification 33% longer battery life 30% lighter weight than other digital night vision riflescopes on the market Engineered for precision placement at medium range,Refer manual and "how to use" video for troubleshooting steps Range of Detection 130 / 120 yd/m (object 1.7m high, illumination level 0.05 lux(1/4moon)