Listen Technologies LS-30-072 iDSP Stationary RF SystemMeet the requirements of the 2010 Americans with Disabilities Act while offering a high quality listening experience with the LS 30 072 Listen iDSP Essentials Starter Stationary RF System. Perfect for providing assisistive listening in venues with a seating capacity of less than 50 people, the LS 30 includes all of the equipment needed to ensure legislative compliance and give your clients and customers access to improved audio.