Beacause normal cameras can't work or can't get clear image at darkness ,that is is a deathful defect for security cameras, so they are not comprehensive in Chinese market. Since 2004,we start to make  the Infrared night view camera to untie the defect. The Infrared light can work not noly daylight but also dark night .not only indoor but also outdoor, so they can safeguard your property every second.