1.The large 42mm objective lens allows you to see farther and wider. The coating adopts FMC broadband coating and Good-quality BAK4 prism to ensure image authenticity. 2.Suitable for adults and children, the ZOOM telescope is a good partner for mountaineering, hiking, driving, racing, tourism, animal watching, bird watching. 3.No fear of any weather, to ensure a more worry- experience for you. The ZOOM telescope is fully rubber armored providing a non-slip grip to the user. The nitrogen-filled design makes the ZOOM telescope multi-use in any environment. 4.16mm large eyepiece &42mm large objective lens The 10-30x42 ZOOM telescope is equipped with a larger eyepiece and objective lens than a normal ZOOM telescope, guaranteeing more light transmittance and a brighter and larger field of view.