No more battery replacement A built-in rechargeable 320mAh Li-polymer battery removes the need for AA batteries, or any removable batteries for that matter. Simply connect the Micro USB cable to your computer's USB port or a power bank. Smart NX-9000BT knows when it’s not being used and manages power efficiently to extend battery life. A full charge provides enough power for about 4 weeks or more of usage. No distraction, Just productivity With advanced Bluetooth 4.0 wireless technology, you get a reliable and secure connection up to 30 feet away. The wireless environment allows you to concentrate on the matters without distraction. Sleek and Comfy, in three glamorous finishes Stylish slim hairline design with smooth touch materials. A superb rubber coating grip gives you total control, and is comfy for long-term use. And now there are three finishes to choose from, gold, silver and iron gray. Engineered for excellence We take great care in designing every aspect of NX-9000BT, especially from the aesthetic presentation and user experience perspectives. We meticulously pursuit the robust assemble quality enclosured with aesthetic product design. No matter from any angle you look at it, it delights you.