Shure SLX4 / L4E - 9.5" UHF diversity receiver, display (low battery, group, channel) 960 frequencies, frequency scan, frequency transmission over infra red, pilot tone, jack/XLR out, removable BNC antennas, rear volume control, 19" rackmount included, frequency range L4E 638-662 MHz, up to 20 systems in parallel (on multiple frequency bands depending on local regulations).