Sig Sauer ECHO RQ35 3.5-28x 35mm Thermal Rifle Scope - The ECHO RQ35 thermal riflescope delivers dependable thermal performance in a compact, efficient configuration designed for practical engagement distances. Featuring a 35mm objective lens and a responsive thermal core, the RQ35 expands your awareness with crisp heat separation-enabling fast detection and confident target differentiation in close-to-mid range environments. Purpose-built for balance and maneuverability, it's an ideal entry point into the ECHO R lineup. LWIR 12um 50Hz thermal core with less than 20mK sensitivity; 35mm Objective lens - Optimized for fast detection and wide situational awareness; Efficient thermal resolution (384x288) - Clear heat contrast for confident identification; Compact, balanced form factor - Maintains natural rifle handling and reduced fatigue; BDX 2.0 enabled - Record, stream, and configure settings via the BDX mobile app; 12-hour runtime - Internal battery with replaceable 18500 external battery support;