Fixed-lens four-megapixel cameras use a set focal length, offering a straightforward choice when the viewing area and camera placement are already established. Choose a varifocal four-megapixel camera when you need to adjust the viewing angle or zoom during installation, such as when coverage distances may vary or precise framing matters.

Four-megapixel IP cameras with Power over Ethernet (PoE) can receive network data and power through one Ethernet cable connected to a compatible active PoE port. Wi-Fi models connect to a 2.4 GHz wireless network, while power must be provided separately, and onboard microSD storage or an NVR can support video recording.

Four-megapixel cameras can connect to a compatible network video recorder through Power over Ethernet (PoE) for centralized live viewing, recording, and management, while many models also support local microSD storage for standalone operation. Depending on the camera, installers can use wired Ethernet or Wi-Fi connectivity and integrate the system with compatible surveillance platforms through ONVIF support, a mobile app, or a broader smart home ecosystem.

Many four-megapixel cameras use low-light image sensors, infrared night vision, or Color at Night illumination to help produce usable video in dim conditions. True Wide Dynamic Range or Digital Wide Dynamic Range helps balance bright and shadowed areas in high-contrast scenes.