Ideal for classrooms and meetings (optional mic needed - sold separately), automobiles (with optional car kit - sold separately) and TV viewing. With a 100' loop wire, up to 30 people can hear clearly. It is also compatible with t-coil equipped hearing aids. Individuals without t-coil hearing aids will need the Induction Loop Receiver OW-10 (sold separately). Made in the USA! The Microloop III loop telecoil system weighs only 3 pounds, making it easy for transport. It includes the loop amplifier, 100' loop wire, wire clips and TV patch cords. Three year warranty.