Cisco AIR-PWRINJ4= power supply unit

Aironet Power Injector f/ 1250 Series (Spare) The power injector for Cisco Aironet 1250 Series Access Points (AIR-PWRINJ4) contains an integrated power supply that converts 100 to 240 volts AC into 56 volts DC and then injects this power onto the Category 5 Ethernet cable to power the access point.

Cisco Aironet Power Injector can be configured to order or can be ordered as a separate item. If the power injector is configured with the access point order, it will ship inside the packaging box of the access point. If the power injector is ordered as a spare, it will ship in a separate box.