Audio Technica VHF Twinmic™ System is a multi-purpose wireless system with 2 microphones, wireless fm transmitter, and receiver. It includes mini lavaliere condenser microphone and dynamic microphone, compact, lightweight transmitter and receiver powered by 9V battery with an optimal operating range between 100 and 300 feet. There are 2 user switchable frequencies for interference-free operation. Also included is a durable, rubber-coated, flexible receiver antenna, a belt-clip, camera mount adapter, and earphone for real-time monitoring capabilities.