This  is the VX-6HD Gen 2 3-18x50 illuminated FireDot Duplex CDS-SZL2.

Professional-Grade optics and HD glass run from 3x to 18x behind a 50 mm objective. Guard-ion sheds water, dirt, and fingerprints. FireDot Duplex is in the second focal plane: heavy posts, a daylight-bright fiber-optic center dot, eight brightness steps, and a push-button control. Motion Sensor Technology sleeps the illumination after five minutes and wakes it on movement. An electronic reticle level flashes when the tube is canted. Side focus sets parallax from 50 yards out. Elevation is CDS-SZL2 with SpeedSet, ZeroLock, and a revolution indicator; windage is ZeroLock. Clicks are 1/4 MOA. Travel is 85 MOA elevation and 85 MOA windage. An integrated throw lever sits on the power ring. Eye relief is 3.7 inches at 3x and 3.8 inches at 18x. Field of view is 38.3 feet at 100 yards on 3x and 6.4 feet on 18x. Alumina flip-back covers are included. The 30 mm tube is 13.5 inches long. Weight is 23.5 ounces. Battery is a CR2032. Waterproof, fogproof, shockproof, made in the USA, lifetime guarantee.

• Manufacturer: Leupold — VX-6HD Gen 2 3-18x50 CDS-SZL2 Side Focus Illum. FireDot Duplex, part 183839, UPC 030317036904
• Optics: 3–18x; 50 mm objective; 30 mm maintube; second-focal-plane illuminated FireDot Duplex; side focus from 50 yd
• Adjustments: CDS-SZL2 / SpeedSet / ZeroLock; 1/4 MOA; 85 MOA elevation and windage; 8 illumination settings; MST; electronic level
• Size: 13.5 in long; 23.5 oz; eye relief 3.7–3.8 in; FOV 38.3–6.4 ft at 100 yd; Alumina flip-backs included
• This listing: this 3-18x50 FireDot Duplex CDS-SZL2 only