Sentry HO462 Little Boy Stereo Headphones, Blue Great for use with smartphones, cell phones, iPod, iPhone, MP3 player, tablets, PCs and laptops, DVD players, for gaming and more Frequency: 20Hz - 20kHz; Impedance: 32 +/- 3 ohms; Sensitivity: 103dB +/- 3dB Acoustic chamber Drive unit diameter: 40mm Tangle-proof 4-foot long flat cord with 3.5mm plug