SIG SAUER ECHO RQ35 3.5-28×35 Thermal Riflescope

SIG SAUER ECHO RQ35 Thermal Riflescope

The SIG SAUER ECHO RQ35 turns heat signatures into a detailed digital sight picture for observation and lawful field use in darkness, daylight, smoke, and visually complex terrain. This listing is for manufacturer part number SOEC31200, a black 3.5-28x35mm thermal riflescope built around a 384×288 long-wave infrared sensor with a 12-micron pixel pitch and 50 Hz refresh rate. Its conventional 30mm main-tube format integrates more naturally with familiar riflescope mounting systems than many box-style thermal sights.

Responsive thermal imaging

The 384×288 core captures temperature differences rather than relying on visible light. A 50 Hz refresh rate produces fluid motion when scanning or following a moving heat source, while the 35mm objective balances field of view and target detail. The base 3.5x magnification provides a useful starting image, and digital magnification extends to 28x when closer inspection is needed. As with all digital zoom systems, increasing magnification enlarges the displayed pixels, so the clearest identification generally comes from using only as much zoom as the situation requires.

The RQ35 provides a 7.6-degree field of view and eight selectable color palettes. Different palettes can make a warm subject easier to distinguish from the background depending on terrain, temperature, weather, and user preference. The optic should be configured before entering the field so the operator can move between palettes and magnification without losing awareness of the surroundings.

Recording and connected features

Integrated recording allows the user to capture still images and video with audio directly through the riflescope. This can support training review, documentation, and sharing of lawful outdoor observations without adding a separate camera to the rifle. The ECHO RQ35 is also BDX enabled, allowing it to participate in SIG SAUER’s compatible connected-optics ecosystem. Available BDX functions depend on the other devices, software versions, settings, and application being used.

Power for extended use

SIG SAUER rates the system for approximately 12 hours of runtime under its specified operating conditions. The power system combines an internal battery with one removable 18500 cell. Actual operating time will vary with display brightness, recording, wireless features, environmental temperature, battery condition, and user settings. Charging and battery handling should follow the current SIG SAUER manual; only the specified battery type and approved charging method should be used.

Weather-resistant construction

The ECHO RQ35 carries an IP67 waterproof rating and is designed for outdoor environments. It measures approximately 14.8 inches long, 2.8 inches wide, and 3.5 inches high, with a listed weight of 31.7 ounces. The traditional scope-like shape, 30mm tube, and black exterior support mounting on an appropriately configured rifle while leaving familiar controls accessible.

Thermal imaging does not remove the need for positive identification or safe firearm handling. Heat signatures can be affected by distance, vegetation, weather, reflective surfaces, and nearby heat sources. Never use a thermal image alone to assume what a distant object is. Follow all applicable laws, property restrictions, hunting regulations, and safe-direction rules.

Setup and use notes

• Confirm the firearm is unloaded before mounting, charging, battery service, or adjustment.
• Use compatible rings and follow the specified ring and base torque values.
• Establish and verify zero using a thermal target appropriate to the chosen distance.
• Configure image palette, brightness, reticle, and recording options before field use.
• Recheck mounting security and zero after impact, transport, or removal.
• Keep lenses protected and clean them only with materials intended for optical surfaces.

Key specifications

• Manufacturer part number: SOEC31200
• Magnification: 3.5-28x
• Objective: 35mm
• Thermal resolution: 384×288
• Sensor: 12-micron LWIR core
• Refresh rate: 50 Hz
• Field of view: 7.6 degrees
• Color palettes: Eight
• Recording: Still images and video with audio
• Connectivity: BDX enabled
• Rated runtime: Approximately 12 hours
• Waterproofing: IP67
• Finish: Black