The Shure Microflex MX153 is a professional subminiature earset microphone ideal for speech and other applications requiring low-profile discreet placement where improved gain before feedback over lavalier microphones is desired. It combines automatic frequency management with true digital diversity for a rock-solid wireless signal with exceptional digital audio clarity. Included In The System 1 x GLXD4 Wireless Receiver 1 x GLXD1 Bodypack Transmitter 1 x MX153 Earset Microphone 1 x Lithium-Ion Rechargeable Battery 1 x Power Supply 1 x Carrying Case 1 x USB Cable MX153 Earset Headworn Microphone Transducer Type: Condenser Frequency Response: Tailored, 20Hz - 20kHz Sensitivity: -41.00 dBV/Pa - 9.00 mV/Pa Equivalent Selfnoise: 34 Sound Pressure: 107 dB SPL Polar Pattern: Omnidirectional Switchable Low Cut: No Connectors: TA4F Attenuator: No Interchangeable Capsule: No Headphone Output: No Weight: 19 g GLXD4 Wireless Receiver Transmission: Digital on 2.4 GHz Type Of Power Supply: External Receiver Housings: Molded ABs Active Antenna Possible: No Bias via BNC: No High Density Mode: No Interference Detection: No Remote Control: Yes Number Of Compatible Systems Per Frequency Band: 8 DANTE Audio Network Interface: No Scan Features: Channel Scan, Group Scan Sync Features: Pairing (2.4 GHz) Detachable Antennas: No Logic: No Cascade: No Receiver Displays: Multi-Function LCD Receiver Type: Single Included Antenna: External 1/2 Wave Battery Status: Leveled Battery Life Indication, HH:MM (Hours & Minutes) Line Mic Switch: No RF Sensitivity: -88 dBm, For 12dB SINAD Phantom Power: Yes