1. Adjust red dot intensity: The red dot intensity setting provides optimal visibility in any lighting condition, allowing shooters to adjust red dot intensity based on current conditions. 2. Accurate aiming: The red dot sight can achieve more accurate aiming with both eyes open. Unlimited eye relaxation helps achieve goals quickly. 3. Markers are visible: Regardless of the lighting or environment, the markers are visible under light and the scene can be seen clearly. 4. All-metal structure: The 1x40RD red dot sight adopts an all-metal structure, which is shockproof, waterproof, and anti-fog. 5. Outdoor portable monocular telescope: The outdoor travel monocular telescope has 1x40 times and an exit pupil diameter of 2mm. Specification Item Type: Outdoor Travel Monocular Telescope Product material: metal Battery type: Button battery (comes with built-in battery) Battery model: CR2032 Battery capacity: 200mAh packing list 1 x monocular telescope 1 x hex wrench 1 wipe 1 manual