The lens of monocular telescope equipped with BAK4 and multilayer coating can ensure excellent light transmittance and brightness. The light transmittance is as high as 99.5%, thus ensuring a clear and bright field of view and restoring things True colors. The monocular telescope have a low-light function that can help you viewing things in low light (but you can't see anything in a completely dark environment) This monocular telescope is suitable for adults and kids, great design help you focus on your target quickly and accurately, you can easily adjust the focusing lens with one hand until you see a clear and bright image Upgraded 40x magnification and 60mm object lens diameter monocular telescope, provides a clearly and bright image. Monocular telescope has large field of view (360ft 1,000Yds) Description: Water-resistant, Dust-proof and shockproof, this monocular telescope for smartphone is the ideal travel companion when you go out on hiking. Thanks to its rugged construction, gives you versatility in all types of weather conditions. The durable rubber armor with stripes makes the monocular for adult comfortable for use with non-slip grip.