Audéo Perfect Bass Earphones offer active music lovers well-defined, luscious sound - with some extra thump. The earphones use specially designed filters to punch up the bass without compromising the music or forcing you to turn up the volume to dangerous and harmful levels. The unique fit and silicone earpieces give you a tight, yet long-lasting and comfortable fit blocking up to 23 dB of ambient noise. You receive a precise, crystal-clear soundstage whenever you want to enjoy your music - on the go, in the gym, up in the air...anywhere. Audéo Perfect Bass Earphones are designed by Phonak, the world"s leading hearing systems experts based in Switzerland. With 60+ years experience and "unparalleled knowledge of the human ear," Phonak engineers developed earphones with a distinctively natural sound that addresses the short-comings of most earphones and earbuds. The design allows the earphones to sit flat against the ear"s concha where they should. As a result, Audéo earphones deliver a comfort, fit and sound usually only found in custom-fitted products. CNET says: "What immediately strikes us with the Audeo Perfect Fit Earphones is how clear and balanced the audio comes through. No instrument or frequency overpowers another. Bass is tight and thumpy, but it"s not the superboomy low end that you tend to get from moderately priced earphones that are trying to overcompensate for what stock earbuds lack in that area." Sound pressure level 107 dB SPL/mW, 1 kHzImpedance 32 ohms, 1 kHzFrequency range 5Hz - 17kHzCable length 3.9 ft/120 cmWeight 0.5 oz/14 gConnection Gold-plated 1/8 in/3.5 mm stereo mini-jack