The small size and convenient wall plug design helps keep the installation simple and clean. The low cost makes them very affordable.
They work by supplying power to the remote device on the unused Ethernet pins 4,5(V+) and 7,8(V-). The Ethernet spec supports distances up to 100m (328 feet). The units are autoranging so that they accept AC inputs from 90VAC to 264VAC (50/60 Hz) and they supply regulated DC Voltage at the POE output. They have various protections for short circuit, overload and overvoltage.
They have power output of up to 24W. They are available in 24V DC Output with load regulation within 5%. They have an LED to indicate power on.
Remotely Power Equipment thru CAT5 Cable up to 100m
Autoranging Switching Power Supply: 100-240VAC
Short Circuit, Over Current and Over Voltage Protection