Philips Extra Bass In-Ear Headphones with Case

3.3 ft cable length. Symmetrical. Music for MP3, CD, iPod, iPhone. Air vents generate dynamic bass. 1. Air vents generates extra bass at low frequencies. 2. Ear cushions improve wearing comfort. Earphones storage case. 3.5 mm chrome-plated plug. 12 - 22000 Hz frequency range. 106 dB sensitivity. 16 Ohm impedance. 50 mW maximum power input. FCC listed. Made in China.