1, according to the mounting options
　　Such as fixed installation, use an ordinary gun-type multi-camera video camera or dome camera; such as the use PTZ installation, now more choice of integrated camera, as SANNO of SN-220C, features: Built-powered zoom lens, compact, easy to install, excellent value for money, it can be an ordinary gun camera comes with power zoom mode, but the price is relatively high, and the integration is not easy to install cameras.
2, selected according to the installation site
　　Since ordinary gun-type camera, it can be either wall-mounted ceiling installation, indoor and outdoor unrestricted therefore, more flexible; and dome cameras, only ceiling installation, so much for the interior and the installation height is limited. But gun-type camera and compared without reprovision the lens, convenient shield, support, installation, beautiful hidden, at an affordable price.
3, according to the ambient light selection
　　If the light conditions are not ideal, we should try to use low illuminance camera, such as super bottom illumination color camera, color black and white automatic conversion dual-cameras, low-light monochrome camera, in order to achieve better collection results. It should be noted that, if the light intensity is not high, but the user when the monitor image clarity higher advised to use black and white camera. If there is no light, you have to add infrared lamps provide lighting or camera with infrared night vision function selection, such as SN-350CWH or SN-350CW camera SANNO of its features are: black and white camera itself has a color conversion mode, comes with the camera and mounting brackets, unique vacuum packaging design, when used indoors without the installation of shields, and beautiful appearance, good for hiding, excellent value for money.
4, according to the requirements for image resolution selection
　　If you require a higher resolution image quality, you should choose a higher index of TV lines camera. In general, color cameras, 420, 450 TVL (TV lines are parsed camera, 470 TVL above are high-resolution cameras. The higher the resolution, relatively higher prices.
5, should also pay attention to some of the performance indicators on-
　　Such as signal to noise ratio, auto iris lens drive methods. General television monitoring system to choose the signal to noise ratio greater than 48dB, so that not only meets the requirements of not less than 38dB of industry standards, and more importantly, when there is insufficient ambient illumination, the higher the SNR of the camera image more clearly ??? Lens drive mode is generally used dual drive so take your pick DC drive or video drive auto iris lens.
6. In addition, selected the camera, install more cautious when
　　In strict accordance with product instructions for proper operation, such as operating temperature, supply voltage. The vast majority of camera manufacturers temperature index is -10 ~ + 50 ℃, such as the use of regional temperature and humidity changes should greatly increase special protection. As the domestic camcorder AC voltage range is generally 200 ~ 240V, anti-supply voltage change is weak, when you need to add a power supply used in the system.