• Unidirectional dynamic microphone<br> • Frequency response: 100 Hz to 1,000 Hz<br> • Sensitivity: -72 dB<br> • Impedance: 600 ohms<br> • Operates on 1 AA battery<br> • Effective distance: 49 to 98 ft. (15 to 30 m)<br> • Includes 2 AA batteries, receiver, wireless antenna, and cable;