National Geographic Expedition Series 8x42 Binoculars dog training technology Post Carbon Block Filter (RF-20):

Post Carbon Block Filter (RF-20): 6 months RO Membrane Filter (RF-40): 24 months

Heavy-Duty Construction for Stability

ECO mode option designed for sustained low battery output demand like CPAP

over currents

Output Power: 3000W

National Geographic Expedition Series 8x42 Binoculars dog training technology Post Carbon Block Filter (RF-20):Features 42mm aperture has ample light gathering capability to produce bright images even in low light situations 8x magnification provides excellent details in distant objects without sacrificing field of view Combination of fully multi coated lenses and superior Bak 4 prisms creates images with rich contrast and clarity Binoculars are waterproof and fog proof for all weather performance Streamlined roof prism design with a sturdy single bridge