The Shure GLXD4R+ is a single-channel digital wireless audio receiver compatible with the GLXD1+ bodypack and GLXD2+ handheld transmitters (available separately) and housed in a metal half-rack chassis with two removable rear-panel antennas. Rackmounting hardware is included, making this model ideal for installations in small venues, houses of worship, conference rooms, and event spaces. Shure's next-generation technology automatically scans both the 2.4 and 5.8 GHz frequency ranges to seek out the best possible digital transmission channel to ensure dependable performance for your presentations, performances, conferences, and events at a typical operating distance of up to 100' indoors and 65' outside.