UN0500 fixed focus lens features ultra-large F1.1 aperture design, with light intake far exceeding traditional lenses. Even in low-light or nighttime environments, it presents bright, clear and detailed images. Combined with 1/1.8" sensor and 4K resolution, it ensures high brightness and low noise day and night, truly achieving day-night co-axial focus without additional lighting or manual refocusing. It is the ideal choice for security surveillance and smart home applications, providing reliable high-definition visual effects 24/7.