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  Power over Ethernet (PoE). PoE is a popular method for powering IP cameras, allowing both data and power to be transmitted over a single Ethernet cable. PoE cameras can be powered by a PoE switch or a PoE injector, simplifying wiring and making it common in larger surveillance systems. Battery-Powered Cameras. Wireless security cameras may be battery-powered, eliminating the need for a traditional power supply. These cameras are rechargeable and can be installed in locations without access to electrical outlets.   Solar-Powered Cameras. In remote or off-grid locations, solar-powered security cameras are an eco-friendly option. They have built-in solar panels that charge a battery, which in turn powers the camera. Hardwired Cameras. Some security cameras are hardwired directly into a building's electrical system. This is common for fixed, indoor cameras that don't require flexibility in their placement. Power Adapters and Transformers. For wired security cam...