The TP-POE-HP-48DX2 is a unique high power PoE injector with Dual 802.3af/at compatible outputs. This means that two devices can be powered from a single PoE injector. The data path between the units is handled by the injector so no PoE switch is required. Power Output is 50W total or 25W per port. They have a standard removable power cord input (North American Power Cord Included). They have various protections for short circuit, overload, and surges caused by ESD or lightning. The built-in surge protection protects sensitive connected devices from damage due to surges on data and PoE lines. All 8 wires are protected. The input voltage and output voltage are isolated to avoid any grounding or negative voltage issues.