NUX B-2 Wireless Guitar System NUX B-2 works like a guitar cable but offers wireless freedom. The Transmitter & Receiver both 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're not playing, B-2 enters Sleep Mode to extend battery life up to 20 hours. And when it's time to recharge simply connect the USB cable (included w/ package) to the transport-coupled Transmitter/ Receiver. Features - 2.4 GHz interference-free signal frequency - 48kHz - 32-bit audio quality - 15 meter (50 feet) operation range (Up to 30 meters in open air) - < 5 ms latency, no lag or signal loss - Up to 20 hours battery life. Auto-sleep energy saver mode - Guitar friendly, adjustable plug smart-design