Sig Sauer Echo MV50, Thermal Monocular, 1.5-24X Magnification, 50mm Objective, Dual View, 640x512 Core Resolution, Flat Dark Earth SOEC42320 Equipped with BDX 2.0 and 10 hour runtime, the ECHO MV50 Thermal Monocular adapts to your situation at any given moment, with all the knowledge you need right in the palm of your hand. The ECHO MV50 measures only 8.1 inches in size and features a 640x512 resolution.