The aperture of the refracting astronomical telescope is 70mm and the focal length is 300mm. The monocular telescope uses coated glass optical elements to enhance the brightness and clarity of the image. Monocular telescope is for balcony viewing, tourism, outdoor sports, watching games, performances, bird watching, wild observation, camping, mountain climbing, adventure, observing terrain, admiring the scenery, etc. The monocular telescope has multiple interchangeable eyepieces with 1.5 times upright eyepiece and 3 times magnification lens. The monocular telescope can improve the viewing ability, and the maximum magnification of 150 times can bring distant scenery into your eyes. The monocular telescope body is compact and sturdy, can resist bad weather, it can resist light water, but can not be used in heavy rain or soaked in water for a long time, monocular HD focus can clearly see fast moving objects. The monocular telescope is easy to assemble without any tools. The monocular telescope adopts aluminum structure, which is light and portable, and is the choice for beginners.