The 30RD-2M is a versatile 30mm Red Dot scope available with both a Dovetail and Weaver mount. With 11 brightness settings, this red dot is excellent for both low light and bright light conditions.Features : MAGNIFICATION LOW: 1X MAGNIFICATION HIGH: N/A OBJECTIVE LENS DIA. (MM): 30 ADJUSTMENT GRADUATION (MOA): 1/2 LENS COATING: Multicoated W/E ADJUSTMENT RANGE: 40 EYE RELIEF (INCHES): Unlimited FOV LOW @ 100 (FT): N/A FOV HIGH @ 100 (FT): N/A