1.[HD Vision and Quality Optics]--Premium Large BAK-4 Prism and 42mm fully multi-coated green film objective lens and 18mm blue film eyepieces guarantee the key elements of an HD vision, brighter view and crisp images 2.Professional 10-30x25 HIGH POWER MAGNIFICATION]--A full 12x magnification and 25mm object lens diameter binoculars, provides a clearly and bright image, enjoy the beauty of the distance, Its length can be adjusted slowly, have the view in your outdoor adventures, just feel to enjoy bird watching, hunting, hiking, camping, travelling, wildlife, scenery, etc. 3.[Adjustable Eye Relief, WATERPROOF & FOG PROOF]--Twist up and down eye cups to adjust the most suitable distance between your eyes and the optical lens, enjoy comfortable viewing even you are a eyeglasses wearers, Nitrogen-Filled waterproof with a fog resistant coating and O-ring sealed optics prevent moisture, dust and debris to keep it clear all the time 4.[, and Easy to Focus]--Compact binoculars is lightweight only 118g, easy to carry and portable to take it with you anywhere,the smooth, large center focus knob and adjustable right eyepiece to fit different view distance, makes it simple to operate and easy to focus, even can use it easily.