This is a Byapssed alternator for the pcm controlled alternator for a 12-15 Honda Civic with a 1.8L Engine. You will have a battery light with these units.
You will need a shorter belt on all of these units, Generally one half inch shorter is adequate. Any parts store can help you with finding a belt that suits your needs. instructions will come with the unit as to how to what else needs to be done for installation, such as the big 3 wiring and wiring a plug if you decide to go with the ignition turn on ELD bypassed unit for 14.8v