Maxell NB-201 Stereo Neckbands Headphone - Stereo - Black - Mini-phone - Wired - 32 Ohm - 16 Hz 24 kHz - Nickel Plated - Behind-the-neck - Binaural - Ear-cup Stereo neckbands worn behind the neck and ears for portable music players Frequency response: 20Hz-22,000Hz Offers 30mm drivers, 32 ohms impedance, 100dB +/-3dB sensitivity 40mW rated input and 100mW maximum input Includes soft-touch rubber 4' cord and 3.5mm straight plug