The Sennheiser CX 200 Street II in white are in-ear headphones that were designed to provide dynamic stereo quality sound to the listener. These Sennheiser headphones also provide strong bass-driven sound and offer a sound frequency of 18 Hz to 21000 Hz, which allows the headphones to provide quality sound from both ends of the sound spectrum. These in-ear headphones that are ideal for use with generic MP3 players, iPods, portable gaming devices, and CD players. These Sennheiser headphones use a dynamic transducer principle and offer a sound pressure level of 113 dB. These are designed to provide high-quality and stable sound as they are being passed through the headphones themselves. The Sennheiser CX 200 Street II also provide excellent passive attenuation of ambient noise. These Sennheiser headphones use a 3.5 mm plug, which allows it to be used in an array of devices. These Sennheiser headphones are lightweight and are easy to travel with. They weigh a mere 5 g.