VocoPro, RCA, Black, Small (SilentSymphony-Solo)Transmitter and receiver headset sold separately Operates in the 900MHz, clear of TV Station interferenceBroadcast audio to an unlimited number of wireless headphone sets use up to 3 transmitters simultaneouslyInternal battery built into transmitter for remote use transmission power level toggle (high/low) available stereo RCA audio input on transmitterAvailable stereo 1/8” audio output on each wireless headphone set headphones have an 18Hr battery life off two AAA batteries
