BAK-4 PRISM & FMC LENSWith the BAK-4 crystal prism and FMC(full multi-coated)green film optic lens, transmittance up to 99.2 percent, imaging effect is clear and sharp, bright picture, color saturation using the Porro system. Guarantee superior light transmission and brightness.PERFECT GIFTS High power monocular is sturdy and portable, with a comfortable handle and a non-slip rubber case to prevent the monocular from slipping out of the hand. IPX7 Nitrogen-filled waterproof protection, providing waterproof, fog proof, dustproof and shockproof protection in any harsh environment. Perfect hoilday gift for friends kids and family.IDEAL FOR OUTDOOR13x magnification system easy to zoom in on target, Perfect accessories designed for bird watching,moon watching, stargazing, wildlife, hiking, camping, fishing, concerts, beach and ball sports.Give you an amazing visual experience!