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.
or more of usage