The perfect handheld "pass-around" microphone for student participation, this dual channel microphone/transmitter, operates on the channel that the teacher is not using. It is powered by two "AA" batteries (Alkaline or rechargeable (1HR-3U only)) and is compatible with all Azden infrared models. Features: Sub-carrier frequencies: 2.06MHz & 2.56MHz switchable Modulation: FM Microphone element type: Uni-directional dynamic Frequency Response: 50-8kHz ñ3dB Battery type: 2-"AA" Alkaline (1.5V...