the t.bone IEM 100 - 770 MHz UHF Wireless In-Ear System - 9.5" stereo transmitter (IEM 100 ST), bodypack receiver (IEM 100 R) and T.Bone EP3 earphones. switchable frequencies, up to 4 parallel systems, frequency range: 768 - 788 MHz, display, mono/stereo switchable, 2x combi-inputs (adjustable on receiver), headphones output, powered via 2x AA batteries, removable BNC antennas, includes rackmount, antennamount and plastic case. Please note: Due to every country having different regulations, you may need to contact your local licensing authorities before using a wireless system.