Sentry HO275 Retro High Performance Stereo Headphones, Black Great to use with iPod, iPhone, computer, MP3 player and more Adjustable fitting color accented stereo headphones with deluxe headband and soft earpads Extra bass, noise cancelling, digital sound headphones with dynamic 40mm driver 4 foot cord length with 3.5mm plug; 20mW power Frequency: 30Hz-20kHz; Impedance: 32 Ohms; Sensitivity: 120dB +/- 3dB