Headset: Trumpet Dia.: f40mm; Impedance: 32O; S.P.L: 108dB±3dB S.P.L.at 1KHz; Rated power:20mW; Rated capacity:30mW; Frequency response:20Hz-20,000Hz; Length of wire: 2m±0.15 Plug-in Spec./:3.5MM mic:6050 -58dB±3dB full way Size: L 200MM* W 175MM* H 87MM G.W: 260g"