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.System Includes:BLX1 Up to 14 hours of continuous use with 2 AA batteries. 300 ft (100 m) transmission radius.BLX4 Single channel wireless receiver with microprocessor-controlled internal antenna diversity.+WL93 Wireless micro-miniature lavalier mic with full, clear sound.FeaturesBLX1Frequency Range: 614MHz-638MHzQuick and easy receiver frequency matchingTQG connection for use with Shure lavalier, headset, earset and instrument microphones and guitar cablesEasily accessible On / Off switchBLX4XLR and ¼ output connectorsTwo-color audio status indicator LED - Green: Normal audio levels, Red: Excessive audio levels (overload / clipping)WL93 Omnidirectional Subminiature Lavalier MicrophoneSubminiature lavalier design; ideal size for theater, television, broadcasting, video, film, and sound reinforcementSmall, inconspicuous mounting hardwareFull, clear sound comparable to larger microphonesSmooth extended frequency response with presence rise specially tailored for chest-worn microphone operationControlled low-frequency rolloff reduces low-frequency clothing and room noiseLow distortion, wide dynamic rangeUniform omnidirectional polar patternPreamplifier assembly (SM93) can be pocketed, strapped to the body, or clipped to belt or waistbandWide-range phantom powering (SM93) accepts all commonly used voltages