Day & Night Vision Rifle Scope Hunting Sight Infrared 850nm LED IR Camera DIY. Diameter of objective lens: 48mm. Type: night vision goggles rack. Display size: 4.3-inch HD display. Installation position: guide rail, rearview mirror. Diameter: suitable for eyepiece diameter of 38-48mm. Compatible battery: 3x 18650 battery 3.7v. Applicable gun types: rifle, shotgun, crossbow. Features: brightness setting, color image display, digital display and comprehensive display. Setting, color image display, digital display, integrated camera, integrated infrared illuminator, ...