Data Drive Thru TRMP09 31.5" Retractable Earphones for MP3/iPod/iPhone (Black/Silver) Data Drive Thru TRMP09 31.5" Retractable Earphones General Features: Black/Silver color Works with any MP3/stereo audio device with standard 3.5 mm audio output 32-ohm impedance 15 % @ 1000 Hz 20 Hz - 20 KHz frequency range 116 3 dB 3 mWatt input power 5 mWatt maximum input power Gold-plated 3.5 mm plug 31.5-inch retractable cord Flat cord eases tangles