Professional personal wireless in-ear monitor system. The NUX B-7 PRO is a personal wireless in-ear monitor system with automatic setup, 2.4 GHz interference-free broadcasting frequency, and 24-bit 48 kHz high-quality stereo audio. The operation range is up to 50 meters (160-feet) with very low latency wireless transmitting. High quality stereo audio monitor. B-7 PRO personal wireless in-ear monitor system delivers stereo audio signal on 2.4 GHz frequency range. That's a global interference-free broadcasting range you can use everywhere without a signal break. With the 24-bit 48 kHz audio quality you will never experience unwanted sound degradation. Automatic setup and friendly matching. The user-friendly matching system makes it easier to use, just turn on the TX & RX and they will be paired with each other within a couple of seconds. Each wireless set has a unique pairing algorithm, it automatically detects each other and configures their own IDs.