FEATURES of the Brunton Echo Pocket Scope Monocular BaK-4 prism glass Multi-coated Polymer frame SPECIFICATIONS of the Brunton Echo Pocket Scope Monocular Weight: 1.8 oz Power: 7x Objective Diameter: 18 mm Overall Dimension: 1.3 x 3.3" Frame: Polymer Close Focus Distance: 1.1 feet Exit Pupil: 2.6 mm Eye Relief: 12 mm Field Of View At 1000 yards: 181 feet Prism Glass Type: Bak-4 Lens Coating Type: Multi Waterproof: No Fogproof / Nitrogen Filled: No Includes: Lanyard and case