SHURE BLX14R/SM31

• Working Range: 91 m (300 ft) Line of Sight
• Audio Frequency Response: 50 to 15,000 Hz
• Total Harmonic Distortion Ref. ±33 kHz deviation with 1 kHz tone 0.5%, typical
• Dynamic Range: 100 dB, A-weighted, typical
• Operating Temperature: -18°C (0°F) to 57°C (135°F)
• Polarity: Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 (with respect to pin 3 of low-impedance output) and the tip of the high impedance 1/4-inch output.

• Audio Input Level: 

• Gain Adjustment Range: 26 dB
• Input Impedance: 1 MΩ
• RF Transmitter Output: 10 mW, typical
• Dimensions: 4.33 in. X 2.52 in. X 0.83 in. (110 mm X 64 mm X 21 mm) H x W x D
• Weight: 2.6  oz. (75 g), without batteries
• Housing: Molded ABS
• Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline
• Battery Life: up to 14  hours (alkaline)

• Output Impedance: 

• Audio Output Level (Ref. ±33 kHz deviation with 1 kHz tone)

• RF Sensitivity: -105 dBm for 12 dB SINAD, typical
• Image Rejection: >50  dB, typical
• Dimensions: 1.65 in. X 7.80 in.X 6.42 in. (42 mm X 198 mm X 163 mm) H x W x D
• Weight (without antennas): 2.2 lbs (998 g)
• Housing: Molded ABS, steel
• Power Requirements: 12–15 V DC @ 260 mA, supplied by external power supply (tip positive)

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