There are models available that support 802.3af and 802.3at as well as models that support Gigabit Ethernet. 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 output. They have various protections for surge, short circuit, overload and overvoltage. The medium power models (TP-POE) have power output up to 24W and the high power models (TP-POE-HP) up to 50W. They are available in 18V, 24V and 48-56V DC Output with load regulation within 5%. The CI model has a special current sense LED which changes color when a POE device is plugged onto the CAT5 cable.