The TrailMaxx Compact Binoculars are extremely durable, compact and lightweight. The perfect binocular to take with you to concerts, sporting events, camping, hiking, traveling and so much more! The TrailMaxx has a center focusing knob with barrels that fold in which allows for easy storage. The multi-coated lenses will allow for crystal clear images. The TrailMaxx binoculars come with a pouch, strap and lens cloth. 8 x 21 mm: Magnification: 8x, Objective Lens: 21 mm, Prism Type: BK-7, FOV: 366' @ 1000 yds., Eye Relief: 10.5 mm. Weight: .54 lbs., Dimensions: 4.125" x 1.875" x 4.125".|10 x 25 mm: Magnification: 10x, Objective Lens: 25 mm, Prism Type: BAK-7, FOV: 288' @ 1000 yds., Eye Relief: 10.5 mm. Weight: .61 lbs., Dimensions: 4.125" x 1.375" x 4.625".