The Microflex Wireless Boundary microphone offers total freedom of placement with no holes to drill or cables to run for installation. The Wireless Boundary Microphone is the perfect solution for conference and meeting spaces where users demand flexibility and high performance. Must be used with amplifier and speakers. Microphone Specifications Type: Condenser (electret bias) Frequency Response: 50-17000 Hz Polar Pattern (at 1 kHz): Cardioid Sensitivity: (at 1 kHz , open circuit voltage): -33 dBV/Pa (33 mV), 1 Pascal=94 dB SPL Dynamic Range 96 dB (1 kΩ load at 1 kHz) Common Mode Rejection: 45 dB minimum (10 Hz to 100 kHz) Preamplifier Output Clipping Level: -6 dBV (0.5 V) (1% THD) Polarity: Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output XLR connector or tip of 1/4" phone plug. Operating Range: 30 m (100 ft.) Note: Actual range depends on RF signal absorption, reflection, and interference Frequency Stability: ±10 ppm Maximum Frequency Deviation: 45 kHz Oscillator Type: Phase-locked loop (PLL) controlled synthesizer Power Requirements: 3V (2 AA alkaline or rechargeable batteries) Battery Life: ≥8 hours (alkaline) Power Consumption: 130 mA, ±15 mA Operating Temperature Range: -18-57 °C (0-135 °F) Note: Battery may limit this range Dimensions: 43 mmH x 87 mmW x 148 mmD (1 11/16 x 3 3/8 x 5 13/16 in.) Weight: Net: 318 g (11.2 oz) Packaged: 516 g (18.2 oz) Transmitter Specifications Overall Dimensions 42 mm H x 197 mm W x 134 mm D (1.65 x 7.76 x 5.28 in.) Net Weight 816 g (1 lb. 13 oz.) Housing Galvanized steel Audio Output Level XLR"