Anchor Audio ALT-9000 - Assistive Listening Transmitter BaseAssistive Listening transmitter base station and 1 4" cable. Anchor Audio's Assistive Listening is designed to help hard of hearing individuals clearly understand speech and other sounds in applications such as house of worship and auditoriums. Or you can use it in noisy environments such as factory tours. Features: 100 Channel UHF Diversity One way Communication Expandable for Unlimited Number of Users ADA Compliant Range up to 300 Line of Sight Easy