Ecko Unltd EKU-CHA-RD Chaos Inner Ear Earphones (Red) Clear dynamic sound with deep bass iPod and iPhone compatible 10mm speaker diameter Frequency response: 18Hz-20kHz 1.25m cable with 3.5mm plug and 3 sizes of silicone gel caps iPod/iPhone Compatible 3 Silicone Gel Caps Included 10 mm speaker 32 OHMS Impendance 3.5mm Plug and 1.25M cable