This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day limited hardware warranty. Smart Listening automatically detects your activity, whether you're travelling in an airport or sitting in a quiet area, then balances the noise cancelling levels accordingly. You can customize your preferences with the Sony I Headphones Connect App. Leave your headphones on: Place your hand over the right ear cup to turn the volume down for instant conversation.Change the track, turn the volume up or down, and take or make calls by tapping or swiping the panel with your fingertip.

【METAL MATERIEL HOUSING DESIGN】The Yinyoo Revonext QT2 metal In Ear earphones is made of full aluminium alloy materiel. High density alloy can be avoid the resonance effect having much better and larger sound field. Greatly enhances the cohesion of the sound, which can effectively avoid the physical resonance effect of the "plastic shell earphone" .It's a good earphone which is used to listen classcial, pop, rock, and ACG songs. 【POWFUL DEEP BASS SOUND IN YOUR EARS】 The Yinyoo Revonext QT2 earbuds with high quality dynamic drivers and balanced armature that pump out powerful deep bass and balanced crisp highs, brings you an exciting listening experience.3.5mm jack contact surface to prevent oxidation, reduces signal loss, and provides better audio restoration.and standard 3.5mm plug is widely compatible with iPhone, iPod, iPad, Smartphone, laptop, computer, tablet etc. 【HIGH PERFORMANCE & EXCELLENT SOUNG】 The Yinyoo Revonext QT2 hybrid iem earphones with special armature and dynamic driver,high performance for audio earphones. Bringing you a new kind of auditory sense, dental, and sound like feeling extremely rich, The mid bass and treble driver unit have a rich, vigorous performance at bass, midrange and treble; bass, mids and treble is rich and energetic. Good for Teen Girls boys Women Men.