Shure BLX14/SM31 Wireless Cardioid Fitness Headset Microphone System (H11: 572 to 596 MHz)

Shure BLX Wireless Systems combine professional-quality sound with simple setup and an intuitive interface for legendary audio performance right out of the box. Precision-built and available in a variety of configurations, it's the most accessible way to own the stage. Frequency Range: 542-572 MHz (Band H10). The rugged and durable SM31FH is a cardioid condenser microphone constructed with hydrophobic materials that make it ideal for true performance in fitness instruction applications. The moisture-repellent cartridge housing ensures a long product life by protecting the microphone from the corrosion damage that causes typical fitness instruction headsets to fail. 

Product Highlights:

• Gain Max: -16 dBV maximum
• Gain Min (0 dB): +10 dBV maximum
• Gain Adjustment Range: 26 dB
• Input Impedance: 1 M
• RF Transmitter Output: 10 mW, typical, varies by region
• Dimensions (H x W x D): 110 mm X 64 mm X 21 mm
• Weight: 75 g (2.6 oz.), without batteries
• Housing: Molded ABS
• Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline
• Battery Life: up to 14 hours (alkaline)
• BLX4 Single Channel Receiver
• Output Impedance: XLR connector: 200 ohms, 6.35 mm (1/4") connector: 50 ohms
• Audio Output Level: Ref. ±33 kHz deviation with 1 kHz tone
• XLR connector: -27 dBV (into 100 ohms load)
• 6.35 mm (1/4") connector: -13 dBV (into 100 ohms load)
• RF Sensitivity: -105 dBm for 12 dB SINAD, typical
• Image Rejection: greater than 50 dB, typical
• Dimensions(H x W x D): 40 mm X 188 mm X 103 mm
• Weight: 241 g (8.5 oz.)
• Housing: Molded ABS
• Power Requirements: 12-15 V DC @ 160 mA (BLX88, 320 mA), supplied by external power supply (tip positive)
• SM13FH Fitness Condenser Microphone
• Type: Electret Condenser
• Frequency Response: 45 to 20,000 Hz
• Polar Pattern: Unidirectional (Cardioid)
• Output Impedance @ 1 kHz: 600 ohms
• Audio Output: Level -50 dBV/Pa
• Signal-To-Noise Ratio @ 1 kHz: 66 dB
• Maximum SPL 1000 ohms load, @ 3% THD: 145.0 dB
• Dynamic Range @ 1 kHz, 1000 ohms load: 117.0 dB
• Equivalent Output Noise, Typical, A-Weighted: 28 dB
• Power Requirements: +5 V DC (nominal), 10 V maximum (DC bias)
• Polarity: Positive pressure on diaphragm produces positive voltage on pin 3 with respect to pin 1
• Cable: 1.1 m (45 in.)
• Connector: TA4F
• Net Weight: 60 g (2.11 oz.)
• Manufacturer: Shure
• Model: BLX14/SM31-H10
• Warranty: See manufacturer website for details
• Our 30-day money back guarantee
• MFR # I387126-N-12-B