The Shure MX890-J3 Wireless Desktop Base is designed to provide cable-free installation of the Shure MX405 and MX410 Gooseneck Microphones. The base features a built-in wireless transmitter that is compatible with Shure's SLX4 and SLX4L series wireless microphone receivers and infrared (IR) sync remotely synchronizes channel and frequency. The internal wireless transmitter eliminates the need to run cable and drill holes. A programmable Mute switch includes push-to-talk and push-to-mute modes. Bi-color LED provides status information and the MX890 is conveniently powered on two AA alkaline batteries.