The Audio Technica ATW-251 Freeway VHF Guitar 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 and the ATW-T201 body-pack transmitter on a specific crystal-controlled frequency. A novel dipole antenna system on the receiver improves operation by providing a ground element in addition to the usual signal element. Guitar cable connects between you guitar and the pocket transmitter for a flawless, direct connection for performance or recording. Signal-to-Noise Ratio - 80 dB at 10 kHz deviation (A-weighted), maximum modulation 15 kHz Total Harmonic Distortion - <1% (+-10 kHz deviation at 1 kHz) Audio Output (balanced) - 350 mV (at 1 kHz, +-10 kHz deviation, 100 K ohm load) Output Connector - 1/4 TS (mono) phone jack Power Supply - 100-240V AC (50/60 Hz) to 12V DC 1A (center positive) switched mode external power supply Dimensions (W x H x D) - 7.48 x 1.65 x 5.12 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. Battery (not included) - 9V (NEDA type 1604) alkaline, not included Current Consumption - 30 mA typical Battery Life - Approximately 15 hours in high position; approximately 8 hours in low position, (depending on battery type and use pattern) Dimensions (W x H x D) - 2.56 x 4.33 x 1.00; about 3 ounces