Wireless Audio for Every OccasionUntether yourself from the 3.5mm shackle, avoid the tangle of wired headphones! A lightweight and comfortable addition to any commute or workout, the EP-B4¡¯s come in a variety of colors, deliver up to 4.5 hours of clean rich sound, and include everything you need to find your perfect fit. Adaptable, Secure, ComfortableWith a secure fit comes great sound, improved noise isolation, and the feeling of nothing being between you and your music. The EP-B4¡¯s can be adapted to the unique shape of your ears with 3 included sizes of ear-tips, 3 pairs of soft ear-hooks, and 3 pairs of ear-fins. Bluetooth 4.1 Experience the latest in Bluetooth audio with A2DP, improved connection stability, faster pairing, and lower power consumption from connected devices (like your phone) when wirelessly streaming audio. Up to 33ft wireless range, rechargeable via micro-USB input, and compatible with iOS, Android and other Bluetooth enabled devices. Whether its your first AUKEY purchase or youre back for more, rest assured that were in this together: All AUKEY products are backed by our 24 Month Product .