Audio-Technica s System 9 is a four-channel frequency-agile wireless system designed to provide rock-solid performance along with easy setup and clear natural sound quality. Featuring sleek stackable contemporary styling System 9 is available in handheld headworn guitar lavalier and body-pack configurations. The system offers four compatible user-switchable VHF channels (169.505 170.245 171.045 and 171.905 MHz). Each System 9 configuration includes the ATW-R900 receiver and either a body-pack transmitter or handheld microphone/transmitter. The ATW-R900 is a non-diversity single-channel receiver with advanced dipole antenna design for extended operating range which improves operation by providing a ground element in addition to the usual signal element. The ATW-R900 also offers volume control along with AF Peak RF and Power indicator lights. Features: Easy operation and clear natural sound quality 4 selectable frequency-coordinated VHF channels Balanced XLR and unbalanced 1/4¡± output jacks enable use with a wide variety of audio gear Reliable performance and durable construction Advanced dipole antenna system for extended operating range Specifications: Operating Frequencies: VHF highband 169 MHz to 172 MHz Modulation Mode: FM Maximum Deviation: +/-10 kHz Dynamic Range: >/=90 dB (A-weighted) typical Total Harmonic Distortion: <1% (at 1 kHz +/-10 kHz deviation) Operating Range: 200 (60 m) typical Open range environment with no interfering signals Operating Temperature Range: 40° F (4° C) to 110° F (43° C) Battery performance may be reduced at very low temperatures Frequency Response: 80 Hz to 13 kHz