The Phiaton, PS 500 headphones take music appreciation to the next level. The Studio Grade 40mm Titanium Drivers and closed-ear type rear enclosure offer better sound reproduction at higher volumes, as well as superior clarity and wide dynamic range at all listening levels. With titanium driver technology for a powerful bass sound, a wide frequency range, and optimized airflow that delivers concert hall sound quality, these earphones are geared directly to high-end audiophiles and users that demand superior sound quality. The PS 500 comes with a standard 3.5mm gold plated plug, as well as a 6.3mm stereo adapter makingthese earphones ideal for all your portable and home theater electronics. Specs include: Impedance: 32 ohm,Sensitivity: 102dB, Max input power: 2000 mW, Weight: 9.1 oz / 259 g without cord, Accessories Includes : 6.3mm stereo gold plated adapter, Owner s guide, 1-Year warranty.