Function: 1. The larger the aperture, the brighter the image; from the same distance, a larger aperture provides better brightness in the field of view. 2. The optical lens features high-definition blue coating and high-quality multi-layer coating for higher light transmittance. 3. Right-eye lever-type adjustment allows for easy, convenient, precise, and accurate focusing with 20-180x magnification. 4. Non-slip knurled focus knob enables smooth and secure focusing; center focusing system with left-eye diopter adjustment for ease of use. 5. Tripod mount at the bottom provides stable connection for photography and video recording, ideal for fixed-point observation under high magnification. Specification: Item Type: Binoculars Prism Material: AK4 Body Cover Material: Rubber Color: As shown in picture Binoculars Size: Approx. 24 x 20 cm / 9.4 x 7.9 inch Weight: Approx. 1343g / 47.4 oz Model: 20-180x100 Structure: Binoculars Function Type: Zoom telescope Purpose: Civilian telescope Magnification: 20-180X Objective Lens Diameter: 60mm / 2.4in Eyepiece Diameter: 18mm / 0.7 inch Lens Coating: Multi-layer wideband blue FMC coating Focusing Method: Central focusing with right-eye adjustment Minimum Focus Distance: 20m ~ 1000m Field of View (m/degree): 56m at 1000m / 4.2 degrees Package List: 1 x Binoculars 1 x User Manual 1 x Bracket 1 x Cleaning Cloth 1 x Hanging Strap 2 x Eyepiece Caps 1 x Binoculars Carry Bag