The Shure MX690 Boundary Microphone features a built-in wireless transmitter that is compatible with Shure's SLX UHF series wireless microphone receivers. The boundary microphone features a cardioid polar pattern for sufficient noise suppression and optimum pick up of conversations, speech, interviews etc. The internal wireless transmitter eliminates the need to run cable and drill holes. A programmable Mute switch includes push-to-talk and push-to-mute modes. Bi-color LED provides status information and the MX690 is conveniently powered on two AA alkaline batteries.

• Transducer	Condenser
  Polar Pattern	Cardioid
  Operating Range	30m (100 ft.)  Note: Actual range depends on RF signal absorption, reflection, and interference
  Frequency Response	50Hz to 17kHz
  Dynamic Range (Typical)	96dB (1kΩ load at 1kHz)
  Signal-to-Noise Ratio	Not Specified By Manufacturer
  Maximum Input Sound Level	Not Specified By Manufacturer
  Power Requirements	3V (2 AA alkaline or rechargeable batteries)  Battery Life: ≥8 hours (alkaline) Power Consumption 130 mA, ±15 mA
  Output Impedance	Not Specified By Manufacturer
  Output Connectors	3-pin XLR
  Pad	No
  Low Frequency Roll-Off	No
  Dimensions (WxHxD)	3.43 x 1.69 x 5.82" (87 x 43 x 148mm)
  Weight	318g (11.2 oz)