It does not have auto detection function and directly supply power to devices by force as soon as you connect them,powered device or poe splitter must conform to standard IEEE 802.3af/at,the same time your powered device must support poe pin 4/5(+),7/8(-)midspan. Power Input = Power Output x 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. Please select according your device power consumption,in order to stable running,the total power consumption must be lower than the total power supply.This POE adapter apply for IEEE802.3af/at standard POE powered devices like , and other IP cameras,or being equipped together with IEEE802.3af/802.3at standard poe splitter for non POE devices. Led:Indicate the working state,Lan port:8ports in RJ45(data in),8port poe RJ45(data&power out),Data in:PC/Hub/Switch/Router,etc.Working temp:0~+40 Celsius.Working humidity:20 ~90% RH non-condensing,Storage temp & humidity:-20~+85 Celsius,10~95% RH,weight:480g Colour:Black Material:ABS + electronic components Product size:10 x 4.7 x 3.1cm Package Contents: 4 x 4 port POE hub 4 x carton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.