Williams AV FM-ADA-KIT-37 FM ADA Compliance KitThis kit provides everything you need to accommodate individuals for hearing accessibility in a small group settings such as libraries, conference rooms and information desks. This portable, easy to use FM system operates at 72 76 MHz on one of 17 selectable channels. This single kit satisfies ADA requirements for multiple room facilities. Features Simple set up and operation T46 transmitter 150 operating range 100 hours receiver battery life Lifetime