The product works great with shorter PoE cables, but it just can't carry as much power over 100 feet. .update: you can definitely use it, just make sure you use a good power source. I needed 12 volts at 2 amps for 8 cameras; about 24 watts each. I bought a 360 watt 12 volt 30 amp power supply and only connected 2.1 x 5.5 wires to it. These adapters work well, even with the extra juice (required because 100ft is too big)
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