Ecko Unlitd. Â"Impact" Headphones Frequency Response- 20-20K Hz Stereo Headphones with Noise Reduction Durable Construction and Frame Speaker Diameter- 57mm Plug Type- 3.5mm Blue Shown. Other Colors Available: MCM Part # Model Color 35-5850 EKU-IMP-COLBK Black 35-5851 EKU-IMP-COLBL Blue 35-5852 EKU-IMP-COLPK Pink 35-5853 EKU-IMP-COLRD Red