1.Resonance Frequency 1150?0% Hz 2.Impedance 8?5%Ω at 1kHz 3.Sensitivity 87?dB at1kHz, 0.1W/0.1m 4.Rated/Max Power 0.5W/1W 5.T. H .D. Less than 10% at 1kHz for S.P.L 6.Temper at Range -40℃～+80℃ 7.Weight Approx 1.3gram