Receiver with 169.505 to 171.905MHz frequency range. Each system 9 professional VHF wireless system includes a receiver and either a body-pack transmitter or a handheld microphone/transmitter. ATW-901 UniPak® body-pack transmitter systems include models pre-packaged with either an AT-GCW guitar cable (/G), a PRO 8HEcW headworn microphone (/H), a PRO 92cW headworn microphone (/H92), a PRO 92cW-TH headworn microphone (/H92-TH), or a lavalier mic (/L) for particular applications. All A-T wireless Essentials® microphones and cables, available separately are pre-terminated for use with any ATW-901 system. Because system 9 packaging is designed to hold all versions of the system, some compartments in the carton may be intentionally left empty. The ATW-R900 receiver includes a switching power supply that automatically adapts to changes in mains voltage. The versatile ATW-T901 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-T902 handheld transmitter features a unidirectional dynamic microphone element. Both the body-pack and handheld transmitters use internal AA batteries and have Power/Mute switches and input Trim (level) adjustments.