The Sig Sauer ECHO RV50 is a thermal riflescope with an integrated laser rangefinder and BDX technology. The 640x512 thermal sensor paired with the 50mm objective lens produces a crisp thermal image across the 2.5-20x magnification range. BDX wirelessly connects the scope to a Sig Kilo rangefinder or the BDX app, feeding range data directly into the ballistic calculator. The reticle then displays the correct holdover point range, calculate, and aim without taking your eye off the target.The RV50 designation puts this in Sig's premium thermal tier with the LRF (laser rangefinder) built into the optic body. That eliminates the need to carry a separate rangefinder for thermal hunting situations where you cannot see conventional reticle references. Multiple color palettes let you switch between white hot, black hot, and color thermal views. Onboard video recording captures thermal footage for review or sharing. The 2.5x base magnification keeps the field of view wide enough for scanning, while 20x on the top end lets you positively identify targets at extended range. For dedicated thermal hunting rigs targeting hogs, coyotes, or other predators at night, the ECHO RV50 combines rangefinding, ballistic calculation, and thermal detection in a single optic. The BDX system is Sig's ecosystem play pair it with a Kilo rangefinder and the scope does the math for you.