Trumpet Diameter: Φ40mm                      Impedance: 32Ω                                      S.P.L: 110dB S.P.L.at 1KHz                   Rated power: 20mW                                   Rated capacity: 30mW                                   Frequency Response: 20Hz-20,000Hz   Cord Length: 2.2m tol 0.15m                                       Plug: Φ3.5 Phone jack                             Mic dimensions: Φ6*5mm                     Mic directivity: Omni directional                 S.P.L:-42 tol 2dB                                  Impedance: ≤2.2KΩ                                 Frequency Response: 30Hz-16,000Hz   Power supply: 4.5V                                 Driver Unit: Φ40mm