TRYBE Optics GEN2 and GEN3 PVS-14 Night Vision Monocular SPECIFICATION : Objective Lens Diamete 1 in Magnification  1 x Field of View, Angle 40 degrees Battery Type AA Focus Rang  9.8 in to Infinity Length 4.5 in Eye Relief 25 mm Battery Quantity 1 Diopter Adj..