Applications Bird watching, Travel, Hiking, Concert, Opera show, Sports games, Camping, Parameters Model: 8x 21 Magnification: 8 times Objective diameter: 21mm Eyepiece diameter:10mm Angle of field: 7 degrees View of field: 362 ft/1,000Yds&114m/1000m Exit pupil diameter: 2.6mm Eye relief: 14mm Mini focus length: 2m Prism: BAK4 Coated: object lens: FMC green coated, eye lens: MC blue coated Focus system: Center focus Product size: 3.9x3.1x1.2inch Item weight: 0.39 lb Package 1 * 8 x 21 Binocular 1 * Cleaning cloth 1* Carry bag 1 * User manual Warranty: No Risk Warranty - 2 years warranty, if you have any issues, please feel free to contact us, we will replace or refund for you without returning.