The NUX B-3 is a rugged 2.4GHz wireless microphone system designed for those who want to enjoy their favourite wired microphone as wireless. The B-3 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. It lasts long up to 5 hours when it's in use, and if you turn off the microphone and leave the B3 running, power-saving sleep mode will be activated.