Williams Sound FM 457 Personal PA FM Assistive Listening System Up to 1000 operating range, Transmitter is FCC Part 15 compliant OLED display, push-button menus, Microprocessor controlled Accommodates any number of listeners; Adjustable power output Combo XLR, " TRS inputs; Meets ADAAG guidelines; Made in the USA Includes: (1) PPA T45 Transmitter, (4) PPA R37 Receivers, (4) EAR 022 Surround Earphones, (2) NKL 001 Neckloops, (4) BAT 001-2 AA Alkaline Batteries, (1) ANT 025 Whip Antenna, (1) TFP 048 Power Supply, (1) WCA 013 RCA 3ft. Audio Cable, (1) IDP 008 ADA Wall Plaque and (1) WLC 004 Main Power Cord (U.S.)