The Behringer Ultralink Ultralink ULM202-USB 2.4 GHz Dual Wireless Microphone System is designed for live sound reinforcement and recording applications. The system consists of two wireless handheld microphone transmitters and two 2.4 GHz USB receivers. Each of the microphones runs for up to eight hours on a pair of AA batteries and includes low battery indicators, integrated volume controls, and a panic mute function. The signal is digitally encrypted and then sent to the USB receiver on the 2.4 GHz bandwidth, beyond the operating frequencies of televisions or cell phones. This helps to minimize interference and other audio artifacts. You can plug the USB receiver into one of Behringer's wireless-ready PA systems or mixers. Alternatively, you can plug the USB receiver into your computer's USB port, and use the microphones to record directly into your favorite DAW.