Feature: 1. Adjust Red Dot Intensity: The red dot brightness setting provides optimal visibility under any lighting conditions, allowing the shooter to adjust the red dot intensity based on the situation at hand. 2. Accurate Aiming: The red dot sight can achieve more accurate aiming with both eyes open. Unrestricted eye relaxation helps to quickly achieve goals. 3. Visible Markings: Regardless of the lighting or environment, the markings are visible in light, allowing for a clear view of the scene. 4. All Metal Structure: 1x40RD red dot sight is made of all metal structure, which is shockproof, waterproof, and anti fog. 5. Outdoor Portable Monocular: Outdoor travel monocular telescope has 1x40 times, and exit pupil diameter 2mm. Specification: Item Type: Outdoor Travel Monocular Telescope Product Material: Metal Weight: Approx. 215g / 7.6oz Battery Type: Button Cell (Shipped With Built In Battery) Battery Model: CR2032 Battery Capacity: 200mAh. Package List: 1 x Monocular 1 x Hex Wrench 1 x Wiping Cloth 1 x Manual