Features: The R300-E is a robust UHF wireless bodypack system, suitable for any application where the convenience of a wireless headworn microphone is required. The system's BP-300 rugged metal bodypack transmitter is simple to use, and is powered by two AA batteries. The system's light-weight, double-ear hook HM3 headworn microphone is comfortable for extended daily use, and provides the user the convenience of hands-free presentations or performances. The receiver's dual antenna diversity helps avoid signal dropouts, and its durable metal frame and chassis can either be used on a tabletop, or rack-mounted with optional rack mounting hardware. Features: ClearScan automatically finds the clearest channel EZsync one-step channel setup HM3 omni-directional microphone 14 hour battery life from two AA alkaline Rugged metal transmitter Metal receiver chassis with optional rack mount Specifications: Frequency Spread : 516.000 MHz - 532.000 MHz NTSC TV Channel Orientation : 21(Lower ) to 24(Upper) Antennas: Flexible TNC 1/2 Wave Audio Frequency Response: 80 Hz - 18kHz +/-2dB Balanced Line Level Output (RMS Adjustable): 10 - 100 mV Battery Life: 14 hours with (2) AA alkaline typical Case Material: metal Connector Type: 1/4 inch unbalanced, 3-pin XLR balanced Controls: on/off, Set, Up, Down, Sync Distortion (@ 1 kHz, 40 kHz deviation): Less than 1.0, 0.4 typical % Diversity: True Antenna Dynamic Range: greater than 95 dB Element: HM-3 Omni-directional headworn Number of Channels: 32 per band, 8 Simultaneous Operating Temperature Range: 5?ø - 45?ø C (41?ø - 113?ø F) Power Requirement: 12-16 VDC, 500 mA max Power Supply: 12 VDC, 500mA max Receiver Type: Synthesized PLL RF Frequency Range: 16 MHz RF Output: 8 mW typical RF Sensitivity (12 dB SINAD): less than 1.0 uV Signal-to-Noise Ratio (A-weighted): greater than 100 dB Squelch: Tone code plus Amplitude Model: R300EC Manufacturer: Electro Voice