1.Resonance Frequency 800?0%Hz 2.Impedance 8?0%Ω at 1kHz 3.Sensitivity 87?dB at 1kHz, 0.1W/0.1m 4.Rated/Max Power 0.5W/0.75W 5.T. H .D. Less than 10% at 1kHz for S.P.L 6.Temper at Range -40℃～+80℃ 7.Weight Approx 2gram