TerraBloom 8-Speed Replacement Digital Speed Controller For EC fans (ECMF series) - TRRS 3.5mm Connection (Current Models)

This speed controller connects to the TerraBloom EC fans using a 16 FT Long Cable With 2 Male TRRS 3.5mm Jacks (the cord is included with all fans)  This speed controller Fits All Currently Sold ECMF Fans Equipped With Wired (Variable Dial) Speed Controller (Manufactured and Sold Late 2019 - current date) This speed controller for EC fans with 8 speed pre-sets and an OFF setting. Each speed step corresponds to a 12.5% increase/decrease in output.