Netis passive PoE extender is a device that extends Power over Ethernet (PoE) and data beyond the standard 100-meter (328 ft) limit using a single Ethernet cable. These extenders are "passive," meaning they do not require an external power source and draw power directly from the incoming PoE cable to transmit data and power further. Models like the P3502CE can extend a network up to 250 meters in "extend mode" or even 350 meters in some configurations, making them suitable for outdoor or long-distance applications like connecting surveillance cameras.