The Nady ALD-800 is a versatile VHF wireless assistive listening system that allows you to share an audio source with multiple listeners up to 300' away making it ideal for museums, theaters, houses of worship, educational facilities, and more. The system includes a transmitter and 4 bodypack receivers but can support an unlimited number of receivers (sold separately), allowing you to add as many listeners as you like. 8 distinct pre-set VHF operating frequencies to choose from for clear transmission, and to set up multiple systems for different applications in the same vicinity. The transmitter has microphone and line level 1/4" input connectors with a manual input gain control and automatic level control function. Each bodypack receiver is compact and lightweight, fitting easily into a pocket. A standard 3.5mm headphone jack accommodates the included stereo earbuds, or most other consumer headphones.