External diameter 2.2 mm / length 1.5 m / tungsten material / focal length 3-50 mm / viewing angle 120 degrees / LED lighting brightness control / 2-way observation / refractive angle 120 degrees <br> / 3.5 inch monitor / 18650 charging battery (3 hours of charging and using) <br> / HDMI image output, screen, reversal image, automatic white balance, video storage, video clip >