Ideal for lecture or speaking environments, worship services, tour groups, long-term care facilities, hospitals, and television viewing! This system is designed and manufactured to provide clear, crisp stereo sound from either of two sources: transmission of normal voice using the supplied microphone or transmission of television, MP3 programming, or any other sound source using the supplied 3.5 mm auxiliary cable. The transmitter then sends the signal, using one of three pre-selected FM radio frequencies, to the receiver. The receiver unit receives the audio signal from up to 150 ft. away and converts it to crystal-clear sound waves that can be heard through the included earbuds and adjusted to the desired volume. System includes: FM transmitter, FM receiver, recharging wall plug, two USB (USB to Mini USB) recharging cables, four “AA” rechargeable batteries, two belt clips, microphone assembly, auxiliary (3.5 mm jack to 3.5 mm jack) cable, earbud assembly, and instruction manual. If you have multiple listeners and need more than one receiver, additional receivers are sold separately. Three-year manufacturers warranty.