1.This ZOOM telescope uses optical technology with fully coated lenses to guarantee excellent light transmission and image brightness, giving you a brighter field of view and sharper images without black streaks. 2.The 10-30x42 handheld telescope also includes a cell phone holder. Smartphone adapters allow you to project images from your ZOOM telescopes onto your phone. The multi-layer broadband coating of 42mm wide objectives and Good-power ZOOM telescopes contributes to better light transmission and resolution, resulting in bright images. 3.10-30X magnification and wide field of view ZOOM telescope provide a more comfortable, larger field of view, sharper details, and an unparalleled viewing experience. Perfect for hiking, camping, bird watching, sports, concerts, travel, scenic viewing. 4.The 10-30x42 ZOOM telescope features advanced full multilayer coating technology and a large BAK4 prism lens that increases light transmission and reduces unwanted light reflections while providing clear, Good-contrast, color-accurate images. Whether you wear glasses or not, this ZOOM telescope can provide a beautiful view on your outdoor adventures without getting dizzy even after long viewings.