eMylo Female 4 Pin to 2x 4pin/3pin Male Extension Cable PC Fan Connector PWM Thermostat keep the air flow balance and prevent hot air backflow when the chassis fan has no acceleration Dual PWM fan, ideal to make the fan quieter and achieve better heat dissipation Cable length: approx 30cm, black color connector. Weight:9g eMylo(TM) is our registered trademark, pls don't follow-sell,othersise you will be held liable.