ITEM NAME:4 Port Poe Injector Poe Power Adapter Ethernet Power Supply Pin 4,5(+)/7,8( V7M3 4 Port Poe Injector Poe Power Adapter Ethernet Power Supply Pin 4,5(+)/7,8( V7M3 It does not have auto detection function and directly supply power to the network devices by force as soon as you connect them,.Power Input = Power Output channels,Take 4Port POE,injector as example:DC48V 4A Input = DC12 V1A Output per channel,DC48V 2A Input = DC48V 0.5A output per channel.If you only use 3 of 4 channels,DC12V3 A input = DC12V 1A output per channel.