The Audio-Technica ATW-251 Freeway VHF Headworn Wireless System is designed to provide reliable performance, easy setup and clear, natural sound quality. The Freeway Wireless Microphone System includes the ATW-R250 receiver, the ATW-T201 body-pack transmitter, and the PRO 8HEcW hands free microphone. A novel dipole antenna system on the receiver improves operation by providing a ground element in addition to the usual signal element.ATW-R250 receiver The ATW-R250 receiver includes a space-saving switching power supply that automatically adapts to changes in mains voltage. Unlike bulky linear power supplies, this switching power supply is lightweight and compact; it uses only a single outlet space. ATW-T201 UniPak body-pack transmitter The versatile ATW-T201 UniPak body-pack transmitter has both a high-impedance input for instruments, and a low-impedance input with bias connection for use with dynamic and electret condenser microphones. The ATW-T201 uses internal 9-volt batteries and has an Off/Standby/On switch, input Trim (level) adjustment, and battery-save switch. PRO 8HEcW headworn microphone Offering highly intelligible individual voice reproduction, the comfortable, lightweight PRO 8HEcW headworn microphone is ideal for guitarists, keyboard players, drummers and others who need the use of their hands during performance. Its low-visibility headband and cushioned support pads provide a stable, comfortable fit. Designed for professional quality v...