Get the sound you crave for with the Sennheiser CX 300 II in-ear headphones. The high-quality dynamic speaker system of these Sennheiser headphones reproduces sound with deep bass effects. The in-ear design of these in-ear headphones reduces external noise, retaining the originality of your music. Listen to music comfortably, thanks to the asymmetrical cable design of the Sennheiser CX 300 II. As these Sennheiser headphones are compatible with iPods, iPhones, MP3, and CD players, you are ensured of a range of applications. With a frequency response of 19 Hz to 21 kHz, these in-ear headphones enable you to listen to a range of sounds.