LD Systems U306 IEM, In-Ear Monitoring System, Frequency range: 655-679 MHz, 12 Selectable channels, Wireless transmission for a range of up to 100 m, Up to 6 systems can be used simultaneously, Frequency range: 50 - 16,000 Hz, Stereo or mono mode, Detachable antenna with BNC connector, Unlimited number of bodypacks can be set to the same transmission frequency, Channel and RF reception displayed on the bodypack, Bodypack has a runtime of 10 h with 2x AA batteries, Includes a 19"" rack mounting kit