Antec TriCool 3 Speed 92mm x 25mm Case Fan 3 speed switch lets you balance quiet performance with maximum cooling 3 pin tachometer connector provides convenient connection to your motherboard 19" lead length allows you all the wire you need! Speed = 1200 - 1600 - 2000 rpm Airflow = 21 - 28 - 38 cfm Bulk packaged, screws included. NO 4 pin adapter included