The Behringer ULTRALINK ULM300USB is a high-performance 2.4GHz digital wireless system with handheld microphone and dual-mode USB receiver. This state-of-the-art transmitter and receiver operate in the 2.4 GHz frequency band, which is well out of the way of TV stations and cell phone towers, two of the main culprits that wreak havoc in the wireless zone. And because it is digitally encrypted, your signal gets through in all its pristine, high-definition quality, without the random artifacts that often plague other wireless systems. The ULM300D receiver not only connects to your PC/Mac for recording into your favorite DAW, but also is compatible with a wide range of Behringer "Wireless Ready" mixers and powered speakers.