The ProVoice Microphone is Designed to Meet Any Audio Need. Undirectional Wired or Wireless 2in1 Handheld Microphone Receiver System. Reduce Background Noise and Feedback. Delivers Clean, Clear Sound that is Ideal for Rehearsal, Performance and Recording. Built-in FM Radio. Handles High Volume Levels Without Distortion. On/Off Switch for Onstage Control. Integral ""POP"" Filter Reduces Explosive Breath Sounds and Wind Noise. Includes 5ft. Cable. FM Frequency: 109mhz-113mhz. Directivity: Undirectional. Frequency Response: 100-10,000Hz. S/N Ratio: 50db. Audio Output Level: 100mv. Output Impedance: 600 Ohm. Operating Voltage: 1.5V DC. Battery Type: AA x 2 (included). Distance: 45ft.