Logitech UE 900 Noise-Isolating Earphones No notes left unheard. We created the Logitech UE 900 Noise-Isolating Earphones for people who live for music and want the best in sound quality. The quad-armature design creates warm sound and the noise-isolating ear cushions provide undisturbed listening. These premium earphones are only surpassed by our professional Stage Monitors, the #1 in-ear monitors used by professional touring musicians. With all our products, the unique UE Sound Signature delivers rich, clear audio that’s perfectly tuned. Quad-armature design Four drivers per ear—two woofers for low frequencies, one driver for mid-range, and one tweeter for high notes—guarantee every note is heard as it was played Three-way crossover directs signals to frequency-specific drivers for clean, well-rounded, textured sound Wide sound stage with soul-satisfying bass, sweet highs and a crisp piano-like timbre UE Sound Signature Sound that’s distinctly and unmistakably UE—pure, undiluted, rich, clear and perfectly tuned Faithfully recreates the original studio recording—and adds a low-end kick 8 sets of ear cushions Get your perfect fit with five pairs of soft silicone ear cushions in sizes XXS to L Three sizes of Comply Foam Tips for greater noise isolation up to 26 dB Large bore openings deliver maximum audio richness and clarity Two detachable cords for music and calls One just for listening to music One with controls and a mic—answer/end calls and get right back to the music without taking your iPhone out of your pocket Adjust volume, pause and change tracks on your iPod, iPhone or iPad with one touch No noise. Just music. Nothing matters but the music—so UE 900 earphones create a secure seal that blocks out annoying background noise. Made to move with you Feel free to rock or roll—the wrap-around ear loops keep your earphones comfortably in place Discreet design sits flush to your ears for a secure fit Road ready Compact hardcase and soft travel pouch protect your earphones and slip easily into a pocket or bag Airline attenuator lowers overall volume for noisy sources such as on airplanes ¼-inch adapter jack connects earphones to professional or home stereo equipment Specifications Input sensitivity 101.2 dB @ 1 kHz, 50mW Frequency response 20 Hz – 20 kHz Noise isolation -26 decibels of ambient stage noise. Impedance 30 Ohms @ 1kHz Internal speaker configuration 4 proprietary balanced armatures with a 3-way crossover Input connector 1/8” headphone jack into any personal monitoring system Warranty 1 year