PoE Detector for IEEE 802.3 or Passive PoE - Quickly identify Power over Ethernet; Display Indicates Passive or 802.3af/at; 24v, 48v, or 56v; and Mode B Reverse Polarity Quickly identify PoE for 802.3af and Passive applications with Pocket Sized Ergonomic shape Detects IEEE 802.3af/at; 24v, 48v, or 56v Passive; Reverse Polarity Mode B Bright LEDs displays type of PoE with clear labels identifying type No Batteries Required - Powered over Ethernet For expert technical support from Austin Texas, please call 512 479 0317