WIRELESS PERFORMANCE: Operates in UHF band, free of interference by utilizing UHF wide audio signal transmission (Up to 89 systems can operate simultaneously). Wireless system enables users to move freely on the stage and in the studio with operating distance from 160 ft. in open space, line of sight. *For longer distance, please avoid thick walls, glass, and metal block LCD DISPLAY FOR EASY MONITORING: LCD display has low battery indicator, and can show frequency number and RF/AF signal strength for easy monitoring the status of the bodypack receiver FIVE MAIN FUNCTIONS: Bodypack receiver has L1, FO, BAL, LO, and EQ functions, which allow you select stereo/mono mode for the bodypack, lock the selected frequency for the bodypack, or adjust the tone/pitch of the music sound. Detailed description of the functions setup can be found in the manual. *NOTE: Need to select OFF for FO function to turn on the stereo mode for the bodypack COMPATIBLE WITH PTM-10: Compatible with Phenyx Pro PTM-10 system. One PTM-10 transmitter can add as many bodypack receivers as you want