Experience true stereo sound with the Tribit XFree Tune Over-Ear Bluetooth Headphones. Offering dual 40mm sound stage drivers, these headphones provide hi-fi stereo audio with rich bass and crisp treble. Likewise, the hi-fi stereo delivers a clear and balanced effect. Complete with advanced noise reduction technology, the over-ear headphones allow you to enjoy a quiet environment. The adjustable headband and cushioned earmuffs ensure that the headphones are comfortable to wear for hours on end. The Tribit XFree Tune headphones come with a built-in rechargeable battery, providing 24 hours of playtime. Simply recharge the headphones for two hours to reach full charge. Additionally, you can use them as wired headphones by connecting the included audio cable. The built-in microphone also comes in handy for making hands-free calls wherever you are.