Sun bard film: 0 density bard film can directly watch the sun with eyes to ensure that strong light will not burn eyes. Star searching mirror: accurately locate the star searching mirror， and quickly find the orientation of the positioning planet with cross cursor star searching mirror. Multilayer coating: multilayer high transmittance coated lenses improve the optical system performance of the telescope for more detailed observation. 400mm focal length: the longer the focal length is， the larger the imaging size and the larger the column size are， the wider the field of vision and depth of view are， and the observation is easier and more convenient. Portable and Convenient: Lightweight and portable, it’s perfect for taking on camping trips, hikes, or family stargazing nights.