The Sennheiser CX 300-II Precision earbud-style headphones are great accessories that you can wear during any type of activity. They are lightweight, so carrying them on the go is easy. This Sennheiser gear has a helpful asymmetrical cable. The cable measures about 36 inches long. The longer end of the Y-shaped cord goes behind the neck and into the opposite ear. The cord's tangle-free design and easy folding structure make it convenient for travel and compact storage. Thanks to a noise-cancelling construction, outside stimuli are blocked out. This gives you a supreme audio experience every time. Any noise from traffic, coworkers, or machinery is eliminated to provide a pure musical experience. The high passive noise attenuation is constantly on so that all you hear is your audio. Their in-the-ear-canal design provides ambient noise isolation to improve your listening experience. A personalized fit helps these headphones remain comfortable and secure in your ears for hours. They are also built tough to last in any environment. The earbuds are made of a flexible silicone material. The earphones form a seal that is customized to the shape of your ears. Each side is labeled for the left or right ear. The silicon provides softness and flexibility for a comfortable headphone experience. It has a conveniently shaped 3.5-millimeter right-angled plug. This allows you to connect your Android smartphones, Samsung phones, tablets, or iPhone products. It also works with your video gaming system, iPod, or an e-reader. Its standard-sized headphone jack also connects to an Apple and Windows desktop or laptop computer. These headphones offer a striking bass, which is perfect for listening to genres like rap and R&B. The Sennheiser earbuds have dynamic transducers that deliver a powerful, bass-driven sound without any humming. The treble notes of each song are crisp, which provides sound quality that's good all-around. You can use these in-ear accessories for podcasts and audio books as they pick up the softest of voices clearly. These products have a 16-ohm impedance. This clarity is ideal for use with cellphones, especially if you are located far from a tower. With a frequency response of 42 to 17,000 Hz, you can hear instruments and voices with ease. Their dynamic transducer delivers an accurate stereo effect for melodies and instrumental songs. They also have 113 dB at 1 kHz per 1 volt of RMS sound pressure level. This allows you to turn your songs up as loud as you desire. Even at maximum volume, these headphones ensure that all sounds are clear and balanced.