A concealed microphone lets you enjoy crystal-clear phone calls without a cumbersome boom getting in your way Easily connect via Bluetooth to compatible stereo mobile devices and experience wireless freedom from up to 10 meters Features apt-X technology that ensures audio content transmitted over Bluetooth is instant and crystal-clear Precisely tuned Neodymium drivers offer superb audio for your music and movie entertainment while delivering accurate voice calls Intuitively & Seamlessly navigate your music library with the simple touch of a button. Easy-access volume & tracking controls make streaming your favorite songs a breeze! Answer Calls with a simple press of the buttons! All ZOOK Blue Headphones feature a built-in Lithium-ion rechargeable battery for up to 6 hours of continuous talk and music play and up to 100 hours of standby time on a full charge to free you from the hassle of frequent battery recharges. The earpads is designed to offer you maximum comfort: the cushions feel smooth like silk, the music is filled with amazingly rich details, and the earphone can be adjusted to fit your head just right. Additionally the headphone comes with a built-in MIC for you to make Skype calls easily. No Bluetooth device handy? No problem.Use your mp3 device to connect via 3.5mm Aux connector cable (included) Use it,Fold it, Carry it, live wire-free! Go Blue with Zoook!