Sig Sauer Echo Thermal RV50, Thermal Weapon Sight, 2.5-20X50mm, 640x512 Core Resolution, BDX 2.0 Enabled, Integrated Rangefinder, Fits 1913 Picatinny Rail, Black SOEC32310 Leveraging years of experience blending innovative electronic technologies with rugged optical systems, SIG SAUER's ECHO thermal category provides a comprehensive spectrum of performance-driven optics to deliver the innovation and quality that has become synonymous with the Sig Sauer name. The ECHO Thermal Sight streamlines the shooting process, eliminating the need for additional devices, charts, and formulas - improving your performance with startling precision. The ECHO Sight provides you with leading-edge capabilities, enabling you to surpass limitations and truly see all of your environment.