The NUX B-4 Plus is a rugged 6 channels wireless microphone system designed for those who want to enjoy their favorite wired microphone as wireless. The B-4 plus is a rechargeable battery powered system that quickly and easily connects to the mic and input xlr jacks. No wires at all and no costly batteries required as it is fully USB rechargeable. Compact size 2.4G wireless microphone system, XLR connection, easy to use. Less than 3.5ms -low latency, clear and stable signal transmission. 24bit/44.1KHz high resolution audio quality. 6 channels design, more choices and less interference. Built-in rechargeable lithium battery, which can be recharged easily via the included USB cable. Specification: Model:NUX B-4 PLUS Operating Band: 2.4G ISM Worldwide Sample Rate:24-bit / 44.1KHz Hi-Resolution Sound Quality Channel:6 Built-in switchable Channels Super Low Latency : < 3.5ms Range : < 100 feet line-0-site Outdoors. Dynamic Range: 110db Operating Band : ISM Worlwide THD + Noise :< 0.02% (1KHz@-10dbFS) Battery life: 7 Hours Power Supply: Built-in Lithium Battery(3.7V 650mAh) Size Chart: 107x25x26mm/4.21x0.98x1.02inch Package Includes: 1x Receiver 1X launcher 1X hot shoe mount 1X USB Charge Cable 1X XLR to 3.5mm line 1X Manual Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping