Note: This kit need the external power adapter to power on the device. Passive PoE Injector and PoE Splitter Kit allows low cost of delivering power over the network cable for shorter distances.
This kit allows power to be carried on 10/100 networks over the spare, unused pairs of a CAT5, CAT5E, CAT6 or CAT7 Ethernet network cable. On shorter network lengths, The power source could feed the wireless access point, IP video surveillance camera,Ip phone etc.
Then the DC voltage run through the spare pairs of the 10BASE-T or 100BASE-T network cable to the Splitter side, And the splitter splits the DC voltage from the network cable into the 5.5mm x 2.1mm DC jack.
Power feed Pins: 4/5(+), 7/8(-)

Instructions:
Power from POE is generally 24v, most standalone devices is 5v to 12v.This product is used with the 12 volt power supply for that camera(ideal for 12Vdc). It just adds the power to the Ethernet cable at one end then removes it at the camera end so you can plug it into the camera power connector. If you look at the image you will see one the round connectors on the one pigtail is a male and the other is a female. If you did not get a 12 volt power supply with the camera you will have to purchase one. It plugs in to a wall outlet and the round plug connects to the POE injector.
Features:

Material: PVC + zinc alloy + copper
--Interface name: RJ45+DC
--Function: network signal + DC power transmission
--Support format: network digital signal
--Compatible video format: network digital signal
--Maximum Support Pixel : 5 Million Pixels
--Anti-interference: >60db
--Impedance: 75 ohms
--Weight：1.82 oz
--DC Jack：2.1x5.5mm
Package Include:
5Pairs PoE injector and splitter cable