Audiology has always been known for it's cheap headphones with a great quality. These headphones are compatible with iPods, MP3 players, portable DVD players and PMPs. The Audiology Samurai AU-100 produces a 20-20000Hz of frequency response, a 32-Ohm of impedance, a 102dB of sensitivity, a max input power of 50mW and a 3.5mm audio jack. $22.46 is all you need to bring home these high quality headphones. Check them out at Amazon.