B-2 uses the latest digital wireless format - it operates in 2.4 GHz broadcasting range, far beyond any radio or TV interference, and it's more than capable of safely handling your audio signal wirelessly.B-2 delivers 32-bit 48 kHz digital wireless sound quality, so you will hear your guitar tone in all of its detailed glory. And with a wide dynamic range of more than 110 dB, you will hear the full frequency range of your guitar or bass. NUX B-2 delivers your instrument signal to your equipment just like a high-quality cable.Both of the Transmitter & Receiver use built-in long-life batteries which can run for up to 20 hours (up to 6 hours of continuous playing time per charge). When you are not playing, B-2 enters Sleep Mode to extend battery life up to 20 hours. And when it is time to recharge, simply connect the USB cable (included w/ package) to the transport-coupled Transmitter / Receiver.