When choosing a CCTV system, the following key points can help you make an informed decision:

1. Purpose and Location: First, clarify the purpose and location of your CCTV installation. Is it for home security, office surveillance, or public areas? Different scenarios require different types of cameras, and indoor and outdoor cameras vary in waterproof and dustproof features.

2. Camera Type: Common cameras include fixed cameras, PTZ (Pan-Tilt-Zoom) cameras, and fisheye cameras. Fixed cameras are suitable for monitoring fixed areas, while PTZ cameras can rotate and adjust angles, making them ideal for larger spaces. Fisheye cameras provide a wide-angle view.

3. Resolution: High-resolution cameras capture clearer images, especially in scenes with more details or when facial recognition is needed. Cameras with 1080P or higher resolution perform better.

4. Night Vision: Choose cameras with infrared night vision to ensure clear images in low-light environments. The farther the night vision distance, the better the monitoring effect.

5. Storage Options: Understand the camera's storage method, whether it supports local storage (SD card, hard drive) or cloud storage. Cloud storage is convenient but may involve additional costs, while local storage needs regular management.

6. Connectivity and Remote Monitoring: Ensure the system supports network connectivity and can be remotely monitored via a smartphone or computer. This allows you to check surveillance footage anytime, anywhere, enhancing security.

7. After-Sales Service and Brand: Opt for reputable brands and suppliers that offer good after-sales service to ensure long-term use and technical support.

By considering these factors, you can choose the CCTV system that best suits your needs.