Built-in microphones capture audio at the camera, while built-in speakers add two-way communication for speaking with people near the camera or playing alerts. Audio input and output connections support external microphones, speakers, or other audio equipment, although some cameras with built-in audio do not allow the built-in microphone and speaker to operate at the same time as the connected audio ports.

Most wired 4K security cameras with audio use Power over Ethernet (PoE), so installers should connect them to a PoE-capable switch or injector with suitable Ethernet cabling to carry network data and power over one connection. Wi-Fi models require a reliable Wi-Fi connection for video and audio traffic, plus local USB-C power, while some models also support optional PoE; plan adequate network bandwidth and recorder or storage capacity for 4K streams.

Choose a fixed lens and wider viewing angle for broad areas such as yards, driveways, or parking lots, or choose a motorized varifocal lens when installers need to adjust the viewing angle and focus for a specific distance. Select a turret for a compact, adjustable installation, or a bullet when the camera’s directional housing suits the mounting location, and confirm that the built-in microphone or two-way audio features match the project’s monitoring needs.

Installers should confirm that the recorder, video management system, or control platform supports 4K video, the camera’s audio stream, and the camera’s connection method, such as Power over Ethernet (PoE) or Wi-Fi. They should also verify ONVIF or platform compatibility, check whether audio uses a built-in microphone and speaker or audio input and output connections, and confirm that the selected audio method supports the required one-way or two-way communication.