Treat yourself to the crystal-clear audio offered by the Logitech Ultimate Ears (UE) 900 in-ear headphones. These high-quality headphones help you discover hidden details in your music you never knew existed. Designed for the discerning audiophile, the UE 900 headphones amaze anyone concerned with audio integrity. Noise-isolating properties make these an excellent choice for anyone unwilling to compromise quality for mobility. Use the UE 900 with headphone amps or unamplified mobile sources. These headphones make great in-ear monitors, or IEMs, because they cancel noise very well. This type of headphone also works for a simple home studio setup. They are very easy to customize and adapt to almost any scenario or need.The Logitech UE 900 has several parts to suit many different applications. The Vi cable has a microphone as well as volume control, and attaches to the regular 3.5-millimeter connection. The soft silicone ear cushions come in five different sizes, ranging from double extra-small to large. The Comply foam tips are available in small, medium, and large sizes. Combine these various pieces for the optimal fit. The components are removable for easy cleaning. A quarter-inch or 6.35-millimeter adapter lets you plug the headphones into larger jacks. An airline adapter is a handy addition for frequent flyers who wish to avoid volume spikes during their travels. The protective hard case and pouch help keep all of the pieces together and safe. This is useful for storage at home, during your daily commute, and on longer journeys. The case fits in your gym bag or purse.The Vi cable attachment for the UE 900 IEM has several close-range and convenient features. These features are activated with just the push of a button. The back has an easy-access microphone while the front has three buttons. The outside buttons control the volume up and volume down features. The middle buttons are used for media and calling controls. Play or pause your media source or answer or hang up on a call on your mobile device with one click. Clicking the button twice rapidly plays the next track on your playlist. A triple click plays the previous track. It also connects to a wireless device for remote control options.The sonic qualities of the 900 are very impressive. Sound is delivered through a four-driver design. Two armature drivers cover the low-end bass, while the mids and highs are delegated one driver each. The result is rich sound and high frequency response from one end of the sound spectrum to the other. The bass rumbles and the clarity of the high-range notes offers a balanced sound with unmatched sonic precision and fidelity.These Logitech UE 900 IEM earphones offer top-notch sound quality and custom controls to fit any ear. The adaptable cables and earpiece accessories let you change the earphone depending on your situation. These Logitech UE 900s offer high levels of isolation without sacrificing other things you really need.