LD Systems U306 IEM HP, In-Ear Monitoring System with Earphones, 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 are displayed on the bodypack, Bodypack has a runtime of 10 h with 2x AA batteries, Includes earphones and a 19"" rack mounting kit