Handheld Dual Mic UHF Wireless Microphone for Public Speaking or Karaoke Item Type: UHF Dual Microphone Handheld Professional Wireless Microphone Comprehensive indicator: Frequency Stability: ≤ 10ppm Modulation Method: FM Audio Response: 40-16000Hz Dynamic Range: >105dB (A weighting) Comprehensive Distortion: ≤0.5% (@1KHz) Audio Processing Method: Dynamic compression and expansion technology Working Temperature: 0C to +50 °C Receiver: Oscillation Mode: Quartz crystal oscillation Audio Output Level: 0-3mV Audio Output Impedance: 600Ω Artifact and Harmonic Suppression: ≥85dB Working Power Supply: AC12V-15V/200mA Microphone: Oscillation Mode: Quartz crystal oscillation Frequency Stability: ≤ 10ppm Maximum Modulation: ±50KHz Maximum Output Power: 30mW Harmonic Radiation: <-55dBc Battery: 2 x AA batteries (not included)