LD Systems U305.1 IEM Wireless In-Ear Monitoring System with Earphones (514 to 542 MHz) User Manual | Page 55 / 56 | Also for: U304.7 IEM TWIN Wireless In-Ear Monitoring System with Two Receivers and Earphones (470 to 490 MHz), U304.7 IEM Wireless In-Ear Monitoring System with Earphones (470 to 490 MHz)